c语言程序无法计算结果 小白求教

Question

#include
float division(float n1,float n2);
int main(void)
{
float num1,num2,num3;
scanf("%f%f",&num1,num2);
while(scanf("%f%f",&num1,num2)==2)
{
num3=division(num1,num2);
scanf("%f%f",&num1,num2);
}
printf("%f\n",num3);
return 0;
}

float division(float n1,float n2)
{
float r,num1,num2;
r=(num1-num2)/(num1*num2);
return r;
}

Answer 1

三处问题：
1.好几处漏了&num2
2.division写的也不对，你根本没有用到传入的参数n1和n2
3.while循环里可以删除下面的scanf

 #include<stdio.h>
float division(float n1,float n2);
int main(void)
{
    float num1,num2,num3;
    scanf("%f%f",&num1,&num2);
    num3=division(num1,num2);
    while(scanf("%f%f",&num1,&num2)==2)
    {
        num3=division(num1,num2);
    }
    printf("%f\n",num3);
    return 0;
}

float division(float n1,float n2)
{
    float r;
    r=(n1-n2)/(n1*n2);
    return r;
}