c - GCC C编译器警告 "warning: control reaches..."

Question

这个问题已经有答案了:

What should main() return in C and C++? (19 个回答)

已关闭 6 年前。

使用“gcc -ansi -Wall -pedantic conc.c”编译时出现以下警告我做错了什么，请帮忙

谢谢

conc.c: In function ‘main’: conc.c:8:1: warning: control reaches end of non-void function [-Wreturn-type]

#include <stdio.h>
void contract(char s1[], char s2[]);
int main()
{
    char s1[] = "abcd";
    char s2[] = "zzzz";
    contract(s1,s2);
}

void contract(char s1[], char s2[])
{
    char temp = 'a';
    int i = 0;
    while (s1[i] != '\0')
    {
        temp = s1[i];
        i++;
    }
    if (i != 2)
    {
        s2[0] = s1[0];
        s2[1] = '-';
        s2[2] = temp;
    }
    printf ("\n The first char string is %s \n the shorten one is %s \n",s1,s2);
}

Answer 1

您的 main 函数没有显式返回任何内容。只需在最后敲击 return 0; 就可以了:

int main()
{
    char s1[] = "abcd";
    char s2[] = "zzzz";
    contract(s1,s2);
    return 0; /* Here! */
}