c语言中定义函数和调用函数（将函数的返回值作为参数传递给其他函数，计算平方差）

1、将函数的返回值作为参数传递给其他函数，计算平方差

#include <stdio.h>

int sqr(int x)
{
    return x * x;
} 

int diff(int a, int b)
{
    return (a > b ? a - b : b - a);
}

int main(void)
{
    int n1, n2;
    puts("please input two integers!");
    printf("n1 = "); scanf("%d", &n1);
    printf("n2 = "); scanf("%d", &n2);
    
    printf("the diff is %d\n", diff(sqr(n1), sqr(n2)));
    return 0;
}