习题2-1

#include<stdio.h>
int main(void)
{
    int num1,num2,a;
    
    scanf("%d%d",&num1,&num2);
    a=num1-num2;
    printf("%d\n",a);
    return 0;
}

#include<stdio.h>
int main(void)
{
    int num1,num2,a;
    
    scanf("%d%d",&num1,&num2);
    a=num1*num2;
    printf("%d\n",a);
    return 0;
}

#include<stdio.h>
int main(void)
{
    int num1,num2,a;
    
    scanf("%d%d",&num1,&num2);
    a=num1/num2;
    printf("%d\n",a);
    return 0;
}

#include<stdio.h>
int main(void)
{
    int num1,num2,a;
    
    scanf("%d%d",&num1,&num2);
    a=num1+num2;
    printf("%d\n",a);
    return 0;
}