1 exit vs. return
If exit is called by the main function or other functions, it will end the process.
Return is called by the main function to end the program, but other function calls will not
1 #include<stdio.h>
2 #include<stdlib.h>
3 int fun()
4 {
5 // exit(0);
6 return 0;
7 }
8 int main()
9 {
10 printf("111\n");
11 printf("222\n");
12 fun();
13 printf("333\n");
14 printf("4444\n");
15 }
They are the printing of exit and return respectively
[email protected]:~/work$ ./a.out
111
222
[email protected]:~/work$ gcc test_exit.c
[email protected]:~/work$ ./a.out
111
222
333
4444
2 exit ends the process you are in
1 /*
2 * fork_test.c
3 * version 1
4 * Created on: 2010-5-29
5 * Author: wangth
6 */
7 #include <unistd.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 int main ()
11 {
12 pid_t fpid; //fpid表示fork函数返回的值
13 int count=0;
14 fpid=fork();
15 if (fpid < 0)
16 printf("error in fork!");
17 else if (fpid == 0) {
18 printf("i am the child process, my process id is %d\n",getpid());
19 exit(0);
20 printf("我是爹的儿子\n");//对某些人来说中文看着更直白。
21 count++;
22 }
23 else {
24 while(1)
25 {
26 sleep(2);
27 printf("i am the parent process, my process id is %d\n",getpid());
28 printf("我是孩子他爹\n");
29 count++;
30 }
31 }
32 printf("统计结果是: %d\n",count);
33 return 0;
34 }