c语言中定义函数和调用函数（计算两个数中的较小值）

1、

#include <stdio.h>

int min2(int a, int b)
{
    if (a < b)
        return a;
    else
        return b;
}

int main(void)
{
    int n1, n2;
    puts("please input two integers!");
    printf("n1 = "); scanf("%d", &n1);
    printf("n2 = "); scanf("%d", &n2);
    
    printf("smaller is: %d", min2(n1, n2));
    return 0;
}

 ↓

#include <stdio.h>

int min2(int a, int b)
{
    int min;
    if (a < b)
        min = a;
    else
        min = b;
    return min;
}

int main(void)
{
    int n1, n2;
    puts("please input two integers!");
    printf("n1 = "); scanf("%d", &n1);
    printf("n2 = "); scanf("%d", &n2);
    
    printf("smaller is : %d\n", min2(n1, n2));
    return 0;
}

↓

#include <stdio.h>

int min2(int a, int b)
{
    int min = a;
    if (b < min)
        min = b;
    return min;
}

int main(void)
{
    int n1, n2;
    puts("please input two integers.");
    printf("n1 = "); scanf("%d", &n1);
    printf("n2 = "); scanf("%d", &n2);
    
    printf("smaller is: %d\n", min2(n1, n2));
    return 0;
}

↓

#include <stdio.h>

int min2(int a, int b)
{
    return (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("smaller is: %d", min2(n1, n2));
    return 0;
}