diff --git a/Addition.c b/Addition.c
new file mode 100644
index 00000000..3ba5312b
--- /dev/null
+++ b/Addition.c
@@ -0,0 +1,15 @@
+#include<stdio.h>
+
+int main()
+
+{
+int num1,num2,addition;
+printf("enter the num1");
+scanf("%d",&num1);
+printf("enter the num2");
+scanf("%d",&num2);
+addition= num1+num2;
+printf ("%d",addition);
+return 0 ;
+
+}
\ No newline at end of file
diff --git a/Area of circle.c b/Area of circle.c
new file mode 100644
index 00000000..d1ea1fed
--- /dev/null
+++ b/Area of circle.c	
@@ -0,0 +1,12 @@
+#include<stdio.h>
+
+int main()
+{
+float r,pie=3.14,area;
+printf("enter the radius ");
+scanf("%f",&r);
+area=pie*r*r;
+printf("area of the circle is %f",area);
+
+return 0;
+}
\ No newline at end of file
diff --git a/Check_Prime_number.c b/Check_Prime_number.c
new file mode 100644
index 00000000..a482c916
--- /dev/null
+++ b/Check_Prime_number.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int n, i;
+    printf("enter a number ");
+    scanf("%d",& n);
+    for (i = 2; i <= n; i++)
+    {
+        n % i != 0 ? printf("it is a prime number") : printf("it is a prime number");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/Convert celsius to fahrenheit.c b/Convert celsius to fahrenheit.c
new file mode 100644
index 00000000..66317e9a
--- /dev/null
+++ b/Convert celsius to fahrenheit.c	
@@ -0,0 +1,12 @@
+#include<stdio.h>
+
+int main()
+{
+float fare,cels;
+printf("Enter the temperature in fahrenheit");
+scanf("fahrenheit=%f",&fare);
+cels=(fare - 32)*0.5;
+printf("the temperature in celsius is %f",cels);
+
+return 0;
+}
diff --git a/Convert days into month.c b/Convert days into month.c
new file mode 100644
index 00000000..a3719fd8
--- /dev/null
+++ b/Convert days into month.c	
@@ -0,0 +1,14 @@
+#include<stdio.h>
+
+int main()
+{
+int n=0,m=0,rd=0;
+printf("enter the no of days ");
+scanf("%d",&n);
+m=n/30;
+rd=n%30;
+printf("Months=%d",m);
+printf("\n Remaining days=%d",rd);
+
+return 0;
+}
\ No newline at end of file
diff --git a/Example of pointer.c b/Example of pointer.c
new file mode 100644
index 00000000..efec358a
--- /dev/null
+++ b/Example of pointer.c	
@@ -0,0 +1,15 @@
+#include<stdio.h>
+
+int main()
+{
+int age=18;
+int*ptr=&age;
+int _age=*ptr;
+printf("  age %d",age);
+printf("\n *ptr %d",*ptr);
+printf("\n _age %d",_age);
+
+return 0;
+
+
+}
\ No newline at end of file
diff --git a/Find no is pos or neg.c b/Find no is pos or neg.c
new file mode 100644
index 00000000..51c9eae9
--- /dev/null
+++ b/Find no is pos or neg.c	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+
+int main()
+{
+int num;
+printf("enter the num");
+scanf("%d",&num);
+if(num>0)
+{
+    printf("the given number is positive");
+}
+else
+{
+printf("the given number is negative");
+}
+return 0 ;
+}
\ No newline at end of file
diff --git a/Find out max no.c b/Find out max no.c
new file mode 100644
index 00000000..68a354dc
--- /dev/null
+++ b/Find out max no.c	
@@ -0,0 +1,19 @@
+#include<stdio.h>
+
+int main()
+{
+int a,b;                        
+printf("enter the value of a ");
+scanf("%d",&a);
+printf("entefr the  value of b");
+scanf("%d",&b);
+if(a>b)
+{
+printf("a is greater than b");
+else
+{
+printf("b is greater than a");
+}
+}
+return 0;
+}
\ No newline at end of file
diff --git a/Given_number_is_prime_or_not.c b/Given_number_is_prime_or_not.c
new file mode 100644
index 00000000..87dae3bc
--- /dev/null
+++ b/Given_number_is_prime_or_not.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+
+int main() {
+
+  int n, i, flag = 0;
+  printf("Enter a positive integer: ");
+  scanf("%d", &n);
+
+  // 0 and 1 are not prime numbers
+  // change flag to 1 for non-prime number
+  if (n == 0 || n == 1)
+    flag = 1;
+
+  for (i = 2; i <= n / 2; ++i) {
+
+    
+    if (n % i == 0) {
+      flag = 1;
+      break;
+    }
+  }
+
+  
+  if (flag == 0)
+    printf("%d is a prime number.", n);
+  else
+    printf("%d is not a prime number.", n);
+
+  return 0;
+}
\ No newline at end of file
diff --git a/Print a number from negative to positive - Copy.c b/Print a number from negative to positive - Copy.c
new file mode 100644
index 00000000..cac0a9c0
--- /dev/null
+++ b/Print a number from negative to positive - Copy.c	
@@ -0,0 +1,14 @@
+#include<stdio.h>
+ 
+int main()
+{
+    int n,low;
+    scanf("%d",&n);
+    low=-n; 
+    while(low<=n)
+    {
+        printf("%d",low);
+        low++;
+    }
+    
+}
\ No newline at end of file
diff --git a/Sum of 2 no by pointers - Copy.c b/Sum of 2 no by pointers - Copy.c
new file mode 100644
index 00000000..a88da247
--- /dev/null
+++ b/Sum of 2 no by pointers - Copy.c	
@@ -0,0 +1,19 @@
+
+
+#include<stdio.h>
+
+int main()
+
+{
+int a , b , *ptr , *qtr, sum;
+printf("enter the value of a");
+scanf("%d",&a);
+printf("enter the value of b");
+scanf("%d",&b);
+ptr=&a;
+qtr=&b;
+sum= *ptr + *qtr;
+printf("%d",sum);
+
+return 0;
+}
\ No newline at end of file
diff --git a/Sum of square and cube upto any given number - Copy.c b/Sum of square and cube upto any given number - Copy.c
new file mode 100644
index 00000000..cf8cb2b4
--- /dev/null
+++ b/Sum of square and cube upto any given number - Copy.c	
@@ -0,0 +1,20 @@
+#include<stdio.h>
+
+int main()
+{
+int no,i=1,square,cube,sum_of_square=0,sum_of_cube=0;
+printf("enter a number");
+scanf("%d",&no);
+while(i<=no)
+{
+   square=i*i;
+   cube=i*i*i;
+   sum_of_square=sum_of_square+square;
+   sum_of_cube=sum_of_cube+cube;
+   i++;
+}
+printf(" sum of square %d of natural numbers id %d",no,sum_of_square);
+printf("\n  sum of cube %d of natural numbers id %d",no,sum_of_cube);
+
+return 0;
+}
\ No newline at end of file
diff --git a/Sum upto given numbers.c b/Sum upto given numbers.c
new file mode 100644
index 00000000..b5eafb6f
--- /dev/null
+++ b/Sum upto given numbers.c	
@@ -0,0 +1,15 @@
+#include<stdio.h>
+
+int main()
+{
+int no,i,sum=0;
+printf("enter the number");
+scanf("%d",&no);
+for(i=1;i<=no;i++)
+{
+printf("%d",i);
+sum+=i;
+}
+printf("\n%d",sum);
+return 0;
+}
\ No newline at end of file
diff --git a/arm num.c b/arm num.c
new file mode 100644
index 00000000..c4c81006
--- /dev/null
+++ b/arm num.c	
@@ -0,0 +1,31 @@
+
+#include <math.h>
+#include <stdio.h>
+
+int main() {
+   int num, originalNum, remainder, n = 0;
+   float result = 0.0;
+
+   printf("Enter an integer: ");
+   scanf("%d", &num);
+
+   originalNum = num;
+
+   for (originalNum = num; originalNum != 0; ++n) {
+       originalNum /= 10;
+   }
+
+   for (originalNum = num; originalNum != 0; originalNum /= 10) {
+       remainder = originalNum % 10;
+
+      result += pow(remainder, n);
+   }
+
+
+
+   if (result == num)1
+    printf("%d is an Armstrong number.", num);
+   else
+    printf("%d is not an Armstrong number.", num);
+   return 0;
+}
\ No newline at end of file
diff --git a/armstrong number.c b/armstrong number.c
new file mode 100644
index 00000000..c6b7c07a
--- /dev/null
+++ b/armstrong number.c	
@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main()
+{
+    int num, remainder, armstrongnumber, p = 0;
+    printf("enter a number");
+    scanf("%d", &num);
+    while (num != 0)
+    {
+        remainder = num % 10;
+        p += (remainder * remainder * remainder);
+        num /= 10;
+    }
+    printf("%d", p);
+    if (num = p)
+    {
+        printf(" it is an armstrong number ");
+    }
+    else
+    {
+        printf(" it is not an armstrong number");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/calculator with switch statment.c b/calculator with switch statment.c
new file mode 100644
index 00000000..c9b590b6
--- /dev/null
+++ b/calculator with switch statment.c	
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+    int a, b, c;
+    printf("enter the value of a");
+    scanf("%d", &a);
+    printf("enter the value of b");
+    scanf("%d", &b);
+    printf("enter the choice");
+    scanf("%d", &c);
+    switch (c)
+    {
+    case 1:
+        printf("addition=%d", a + b);
+
+        break;
+    case 2:
+        printf("subtraction=%d", a - b);
+
+        break;
+    case 3:
+        printf("multiplication=%d", a * b);
+
+        break;
+    case 4:
+        printf("division=%d", a / b);
+
+        break;
+    case 5:
+        printf("module=%d", a % b);
+
+        break;
+
+    default:
+        printf("invalid operation");
+        break;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/count_digit_in_num.c b/count_digit_in_num.c
new file mode 100644
index 00000000..e25fa62c
--- /dev/null
+++ b/count_digit_in_num.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+    int n,m, c = 0;
+    printf("enter the number ");
+    scanf("%d", &n);
+    
+    while (n!= 0)
+    {
+
+     
+        m= n % 10;
+
+        c = c + m;
+        n=n/10;
+        
+        
+    }
+    printf("sum=%d", c);
+}
\ No newline at end of file
diff --git a/find 3 angle of triangle.c b/find 3 angle of triangle.c
new file mode 100644
index 00000000..47d22dd7
--- /dev/null
+++ b/find 3 angle of triangle.c	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+
+int main()
+{
+int a,b,c;
+printf("enter the value of a");
+scanf("%d",&a); 
+printf("enter the value of b");
+scanf("%d",&b);
+c=180-(a+b);
+printf("%d",c);
+return 0;
+
+
+
+
+}
\ No newline at end of file
diff --git a/find max no by pointer.c b/find max no by pointer.c
new file mode 100644
index 00000000..d8b3dc80
--- /dev/null
+++ b/find max no by pointer.c	
@@ -0,0 +1,22 @@
+#include<stdio.h>
+
+int main()
+
+{
+int a , b , *ptr1 , *ptr2;
+printf("enter the value of a");
+scanf("%d",&a);
+printf("enter the value of b");
+scanf("%d",&b);
+ptr1=&a;
+ptr2=&b;
+if(*ptr1>*ptr2)
+{
+printf("%d is the maximum number",*ptr1);
+}
+else
+{
+printf("%d id the maximum number",*ptr2);
+}
+return 0;
+}
\ No newline at end of file
diff --git a/for print the n odd no.c b/for print the n odd no.c
new file mode 100644
index 00000000..edf1cf66
--- /dev/null
+++ b/for print the n odd no.c	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+
+int main()
+{
+int n,i,sum;
+printf("enter the value of n");
+scanf("%d",&n);
+printf("\n %d odd number",n);
+for(i=1;i<=n;i=i+2)
+{
+    n%2!=0;
+printf("%d",i);
+}
+sum+=i;
+printf("%d",sum);
+return 0;
+}
\ No newline at end of file
diff --git a/low to high.c b/low to high.c
new file mode 100644
index 00000000..5a5d5686
--- /dev/null
+++ b/low to high.c	
@@ -0,0 +1,16 @@
+#include<stdio.h>
+
+int main()
+{
+int n;
+printf("enter a number ");
+scanf("%d",&n);
+ int low=-n;
+ while(low<=n)
+{
+    printf("%d",low);
+    low++;
+
+}
+return 0;
+}
\ No newline at end of file
diff --git a/max no out of 3 no.c b/max no out of 3 no.c
new file mode 100644
index 00000000..9e27e77a
--- /dev/null
+++ b/max no out of 3 no.c	
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+int main()
+{
+    int nm1, nm2, nm3;
+    printf("enter the value of number 1-");
+    scanf("%d", &nm1);
+    printf("enter the value of number 2-");
+    scanf("%d", &nm2);
+    printf("enter the value of number 3-");
+    scanf("%d", &nm3);
+    if (nm1 > nm2 && nm1 > nm3)
+    {
+        printf("the number 1 is maximum number");
+    }
+    else if (nm2 > nm1 && nm2 > nm3)
+    {
+        printf("the number 2 is maximum number");
+    }
+    else
+    {
+        printf("the number 3 is maximum number");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/month and days.c b/month and days.c
new file mode 100644
index 00000000..ca9d7ef1
--- /dev/null
+++ b/month and days.c	
@@ -0,0 +1,25 @@
+
+#include<stdio.h>
+
+int main()
+{
+    int number_of_days, years, months, days;
+
+    /* Reading number of days from user */
+    printf("Enter number of days: ");
+    scanf("%d", &number_of_days);
+
+    years = number_of_days / 365;
+
+    
+    months =number_of_days/30 ;
+
+    days = (number_of_days - years * 365 - months*30);
+
+    // Displaying results
+    printf("Years = %d", years);
+    printf("\nMonths = %d", months);
+    printf("\nDays = %d", days);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/odd or even with using else.c b/odd or even with using else.c
new file mode 100644
index 00000000..df2f9aaa
--- /dev/null
+++ b/odd or even with using else.c	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+
+int main()
+{
+int no;
+printf("enter the number ");
+scanf("%d",&no);
+if(no%2!=0)
+{
+    printf("the given number is odd ");
+}
+else 
+{
+    printf("the given number is even");
+}
+return 0;
+}
\ No newline at end of file
diff --git a/odd or even without else.c b/odd or even without else.c
new file mode 100644
index 00000000..f9d3cb36
--- /dev/null
+++ b/odd or even without else.c	
@@ -0,0 +1,10 @@
+#include<stdio.h>
+
+int main()
+{
+int no,result,odd,even;
+printf("enter a number ");
+scanf("%d",&no);
+no%2!=0 ?printf("the given no is odd ") : printf("the given no is even");
+return 0;
+}
\ No newline at end of file
diff --git a/odd_or_even_of_10_no.c b/odd_or_even_of_10_no.c
new file mode 100644
index 00000000..29c7efeb
--- /dev/null
+++ b/odd_or_even_of_10_no.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <math.h>
+int main()
+{
+    int n, count = 0, i, d = 0, c = 0;
+
+    for (i = 1; i <= 10; i++)
+    {
+        printf("\nenter the number");
+        scanf("%d", &n);
+    
+  
+        if (n% 2 == 0)
+        {
+            printf("\n%d is a even number", n);
+            d=d+1;
+        }
+        else
+        {
+            printf("\n%d is a odd number",n );
+            c=c+1;
+        }
+    }
+    printf("\ncounteven=%d", d);
+    printf("\ncountodd=%d", c);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-1.c b/pattern-1.c
new file mode 100644
index 00000000..1183ab83
--- /dev/null
+++ b/pattern-1.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j;
+    for (i = 1; i <=4; i++)
+    {
+            for (j = 1; j <= 4; j++)
+            {
+                printf("*");
+            }
+            printf("\n");
+        }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-10.c b/pattern-10.c
new file mode 100644
index 00000000..0edaa47d
--- /dev/null
+++ b/pattern-10.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, n, s;
+    printf("enter the value of n");
+    scanf("%d", &n);
+    for (i = 1; i <= n; i++)
+    {
+  
+
+        for (j = 1; j <=i; j++)
+        {
+            printf("*");
+        }
+        
+
+            printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-11.c b/pattern-11.c
new file mode 100644
index 00000000..bbf2b086
--- /dev/null
+++ b/pattern-11.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, s, j, n;
+    scanf("%d", &n);
+    for (i = 1; i <= n; i++)
+    {
+        for (s = 1; s <=2*i-1; s++)
+        {
+            printf(" ");
+        }
+           
+        for (j = 1; j <=i; j++)
+            {
+                printf("*");
+            } 
+        
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-12.c b/pattern-12.c
new file mode 100644
index 00000000..f9f66238
--- /dev/null
+++ b/pattern-12.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, s, n;
+    printf("enter the value of n");
+    scanf("%d", &n);
+    for (i = 1; i <= n; i++)
+    {
+        for (s = 1; s <= n - i; s++)
+        {
+            printf(" ");
+        }
+        for (j = 65; j <= i+64; j++)
+        {
+            printf("%c", j);
+            
+        }
+        printf("\n");
+    }
+   
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-2.c b/pattern-2.c
new file mode 100644
index 00000000..1cbe3259
--- /dev/null
+++ b/pattern-2.c
@@ -0,0 +1,18 @@
+#include<stdio.h>
+
+int main()
+{
+    int i,j,s;
+    printf("enter the no of stars");
+    scanf("%d",&s);
+    for(i=1;i<=s;i++)
+    {
+        for(j=1;j<=i;j++)
+        {
+        printf("*");
+        }
+    printf("\n");
+    }
+    
+return 0;
+}
\ No newline at end of file
diff --git a/pattern-3.c b/pattern-3.c
new file mode 100644
index 00000000..d2d5048c
--- /dev/null
+++ b/pattern-3.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, s;
+    printf("enter the no of rows");
+    scanf("%d", &s);
+    for (i = s; i >= 1; i--)
+    {
+        for (j = 1; j <= i; j++)
+        {
+            printf("*");
+        }
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-4.c b/pattern-4.c
new file mode 100644
index 00000000..07ac022a
--- /dev/null
+++ b/pattern-4.c
@@ -0,0 +1,17 @@
+#include<stdio.h>
+
+int main()
+{
+    int i,j,s;
+    scanf("%d",&s);
+    for(i=1;i<=5;i++)
+    {
+        
+        for(j=1;j<=i;j++)
+        {
+            printf(" *");
+        }
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-5.c b/pattern-5.c
new file mode 100644
index 00000000..002ee9f8
--- /dev/null
+++ b/pattern-5.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main()
+
+{
+
+    int i, j;
+
+    for (i = 5; i >= 1; i--)
+    {
+        for (j = 11; j <= 2*i - 1; j++)
+        {
+            printf("*");
+        }
+    }
+
+    return 0;
+}
diff --git a/pattern-6.c b/pattern-6.c
new file mode 100644
index 00000000..63aa4fa4
--- /dev/null
+++ b/pattern-6.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j;
+
+    for (i = 1; i <= 7; i++)
+    {
+
+        for (j = 1; j <= i; j++)
+        {
+            if (j == 1 || i == j || i == 7)
+            {
+                printf("*");
+            }
+            else
+
+                printf(" ");
+        }
+
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-7.c b/pattern-7.c
new file mode 100644
index 00000000..7026319c
--- /dev/null
+++ b/pattern-7.c
@@ -0,0 +1,22 @@
+
+#include <stdio.h>
+
+int main()
+{
+    int i, j, s;
+          printf("      *\n");
+    for (i = 1; i <= 5; i++)
+    {
+        for (s = i; s < 5; s++)
+        {
+            printf(" ");
+        }
+        for (j = 1; j<=i; j++)
+        {
+            printf("**");
+        }
+
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-8.c b/pattern-8.c
new file mode 100644
index 00000000..1a499db4
--- /dev/null
+++ b/pattern-8.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, n, s;
+    printf("enter the value of n");
+    scanf("%d", &n);
+    for (i = 1; i <= n; i++)
+    {
+
+        for (s = 1; s <= n - i; s++)
+        {
+            printf(" ");
+
+           }   for (j = 1; j <= i; j++)
+            {
+                printf("*");
+            }
+        
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern.c b/pattern.c
new file mode 100644
index 00000000..326e7f6b
--- /dev/null
+++ b/pattern.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, n, s;
+    printf("enter the value of n");
+    scanf("%d", &n);
+    for (i = 1; i <= n; i++)
+    {
+      for (j = 1; j <= i-1; j++)
+            {
+                printf("*");
+            
+        for (s = 1; s <n; s++)
+        {
+            printf(" ");
+       
+          
+        
+          } 
+             } printf("\n");   
+    
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/print the name by two digit.c b/print the name by two digit.c
new file mode 100644
index 00000000..957fc149
--- /dev/null
+++ b/print the name by two digit.c	
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+int main() {
+  
+    int i,d,j;
+    char a[100],m;
+    scanf("%s",&a);
+    for(i=0;i<1;i++)
+    {
+         printf("\n%c %c",a[0],a[1]);
+          printf("\n%c %c",a[2],a[3]);
+           printf("\n%c %c",a[4],a[5]);
+  
+
+      
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/print the sine fun - Copy.c b/print the sine fun - Copy.c
new file mode 100644
index 00000000..2b171522
--- /dev/null
+++ b/print the sine fun - Copy.c	
@@ -0,0 +1,14 @@
+#include<stdio.h>
+#include<math.h>
+
+int main()
+{
+    double sinevalue,x;
+    printf("please enter the value of calculate sine");
+    x=0.5;
+    sinevalue= sin(x);
+    printf("the sine value of %f is = %f",x,sinevalue);
+
+   
+    return 0;
+}
\ No newline at end of file
diff --git a/print value of sine and cos function for interval - Copy.c b/print value of sine and cos function for interval - Copy.c
new file mode 100644
index 00000000..a60c98db
--- /dev/null
+++ b/print value of sine and cos function for interval - Copy.c	
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <math.h>
+int main()
+{
+
+  double interval, i;
+  printf("Enter the interval (eg. 0.1):\n");
+  scanf("%lf", &interval);
+  for (i=0 ;i <= 1; i += interval)
+   {
+    printf("sin(%.1f)=%.3f\n", i, sin(i));
+    printf("cos(%.1f)=%.3f\n", i, cos(i));
+
+  }
+  return 0;
+}
\ No newline at end of file
diff --git a/sum_of_all_digits.c b/sum_of_all_digits.c
new file mode 100644
index 00000000..5c29954c
--- /dev/null
+++ b/sum_of_all_digits.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+int main() {
+	int n,m,sum=0;
+    scanf("%d",&n);
+  while(n>0)
+  {
+    
+        m=n%10;
+        sum=sum+m;
+        n=n/10;
+  }
+    printf("%d",sum);
+    return 0;
+}
\ No newline at end of file
diff --git a/sum_of_first_and_last_num - Copy.c b/sum_of_first_and_last_num - Copy.c
new file mode 100644
index 00000000..6f776d3f
--- /dev/null
+++ b/sum_of_first_and_last_num - Copy.c	
@@ -0,0 +1,27 @@
+#include<stdio.h>
+#include<math.h>
+
+int main()
+{
+    int n , m,c=0;
+    printf("enter the nummber ");
+    scanf("%d",& n);
+    while(n!=0)
+    {
+        
+        m=n%10;
+        c=c+m;
+        n=n/10;
+        break;
+    }
+     while(n!=0)
+    {
+        n=n/10;
+        m=n%10;
+        c=c+m;
+        
+        break;
+    }
+    printf("sum of last two digit=%d",c);
+return 0;
+}
\ No newline at end of file