3582.c

#include <stdio.h>

void sumDiff(int, int, int *, int *);

int main(void)
{
  int a, b, sum, diff;

  while(scanf("%d %d", &a, &b) != EOF) {
    sumDiff(a, b, &sum, &diff);
    printf("sum=%d diff=%d\n", sum, diff);
  }
  return 0;
}

void sumDiff(int op1, int op2, int *pSum, int *pDiff)
{
  *pSum = op1 + op2;
  *pDiff = op1 - op2;
}