编写五个函数实现数学运算，加，减，乘，除，%

#函数那一章节
#不知道该如何编写，请各位赐教。

#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;
}

//编写五个函数实现数学运算，加，减，乘，除，%
#include <stdio.h>
int fun1(int a,int b)
{
    return a+b;
}
int fun2(int a,int b)
{
    return a-b;
}
int fun3(int a,int b)
{
    return a*b;
}
int fun4(int a,int b)
{
    return a/b;
}
int fun5(int a,int b)
{
    return a%b;
}
int main()
{
    int a,b;
    scanf("%d%d",&a,&b);
    printf("%d+%d=%d\n",a,b,fun1(a,b));
    printf("%d-%d=%d\n",a,b,fun2(a,b));
    printf("%d*%d=%d\n",a,b,fun3(a,b));
    printf("%d/%d=%d\n",a,b,fun4(a,b));
    printf("%d%%%d=%d\n",a,b,fun5(a,b));
    return 0;
}

#include<stdio.h>
int Sum(int a,int b)
{
return a+b;
}
int Minus(int a,int b)
{
return a-b;
}
int Ride(int a,int b)
{
return ab;
}
int QuYu(int a,int b)
{
return a%b;
}
int Deside(int a,int b)
{
return a/b;
}
int main()
{
int a,b;
scanf("%d%d",&a,&b);
printf("a+b=%d\n",Sum(a,b));
printf("a-b=%d\n",Minus(a,b));
printf("ab=%d\n",Ride(a,b));
printf("a/b=%d\n",Deside(a,b));
printf("a%%b=%d\n",QuYu(a,b));
return 0;
}
如果有帮助的话请采纳一下谢谢