编写五个函数实现数学运算，加，减，乘，除，%

Question

#函数那一章节
#不知道该如何编写，请各位赐教。

Answer 1

#include <stdio.h>

int add(int n1,int n2){
  return n1+n2;
}

int sub(int n1,int n2){
    return n1-n2;
}
int mul(int n1,int n2){
    return n1*n2;
}
int div(int n1,int n2){
    return n1/n2;
}
int fun(int n1,int n2){
    return n1%n2;
}
int main()
{
    int a,b;
    printf("输入两个整数:");
    scanf("%d%d",&a,&b);
    printf("%d+%d=%d\n",a,b,add(a,b));
    printf("%d-%d=%d\n",a,b,sub(a,b));
    printf("%d*%d=%d\n",a,b,mul(a,b));
    printf("%d/%d=%d\n",a,b,div(a,b));
    printf("%d%%%d=%d\n",a,b,fun(a,b));
    return 0;
}