return和exit

return从当前函数返回而exit结束正在运行的程序

示例：

[wangml@iZwz976helaylvgqok97prZ testForC]$ ./exit.test
q
[wangml@iZwz976helaylvgqok97prZ testForC]$ ./exit.test
a
Here!
[wangml@iZwz976helaylvgqok97prZ testForC]$ cat exit.test.c
#include <stdio.h>
#include <stdlib.h>

void testExit(char ch);

int main(int argc, char **argv)
{
    char ch;
    scanf("%c", &ch);

    testExit(ch);

    printf("Here!\n");

    return ;
}

void testExit(char ch)
{
    if (ch == 'q')
    {
        exit();
    }

    return;
}