c语言中函数的定义和调用（计算两个数中的较大值）

 

1、函数定义和函数调用

#include <stdio.h>

int max2(int a, int b)    ## 函数头：返回类型， 函数名，形参声明a，形参声明b
{
    if (a > b)
        return a;         ## 函数体（复合语句）        ## 函数定义
    else
        return b;
}

int main(void)
{
    int n1, n2;
    puts("please input two integer!");
    printf("n1 = "); scanf("%d", &n1);
    printf("n2 = "); scanf("%d", &n2);
    
    printf("larger is: %d\n", max2(n1,n2));    ## 函数调用， n1和n2为实参。

    return 0;
}

 

↓

#include <stdio.h>

int max2(int a, int b)
{
    int max;
    if (a > max)
        max = a;
    if (b > max)
        max = b;
    return max;
}

int main(void)
{
    int n1, n2;
    puts("please input two integers!");
    printf("n1 = "); scanf("%d", &n1);
    printf("n2 = "); scanf("%d", &n2);
    
    printf("larger is: %d\n", max2(n1, n2));
    return 0;
}

 

↓

#include <stdio.h>

int max2(int a, int b)
{
    int max = a;
    if (b > max)
        max = b;
    return max;
}

int main(void)
{
    int n1, n2;
    puts("please input two integers!");
    printf("n1 = "); scanf("%d", &n1);
    printf("n2 = "); scanf("%d", &n2);
    
    printf("larger is: %d", max2(n1, n2));
    return 0;
}

 

↓

#include <stdio.h>

int max2(int a, int b)
{
    return a > b ? a : b;
}

int main(void)
{
    int n1, n2;
    puts("please input two integers!");
    printf("n1 = "); scanf("%d", &n1);
    printf("n2 = "); scanf("%d", &n2);
    
    printf("larger is: %d\n", max2(n1, n2));
    return 0;
}