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variaveis.cpp
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#include <stdio.h>
#include <stdlib.h>
void troca(int *x, int *y){
int temp = *x;
*x = *y;
*y = temp;
}
int main(){
int a = 20, b = 25, c = 30, d = 40;
int *pa = &a;
int *pb = &b;
int *pc = &c;
int *pd = &d;
troca(pa,pb);
printf("valor A: %d\nvalor B: %d\n",a,b);
printf("\n");
troca(pa,pc);
printf("valor A: %d\nvalor C: %d\n",a,c);
printf("\n");
troca(pa,pd);
printf("valor A: %d\nvalor D: %d\n",a,d);
printf("\n");
troca(pb,pa);
printf("valor B: %d\nvalor A: %d\n",b,a);
printf("\n");
troca(pb,pc);
printf("valor B: %d\nvalor C: %d\n",b,c);
printf("\n");
troca(pb,pd);
printf("valor B: %d\nvalor D: %d\n",b,d);
printf("\n");
troca(pc,pa);
printf("valor C: %d\nvalor A: %d\n",c,a);
printf("\n");
troca(pc,pb);
printf("valor C: %d\nvalor B: %d\n",c,b);
printf("\n");
troca(pc,pd);
printf("valor C: %d\nvalor D: %d\n",c,d);
printf("\n");
troca(pd,pa);
printf("valor D: %d\nvalor A: %d\n",d,a);
printf("\n");
troca(pd,pb);
printf("valor D: %d\nvalor B: %d\n",d,b);
printf("\n");
troca(pd,pc);
printf("valor D: %d\nvalor C: %d\n",d,c);
return 0;
}