#include <glib.h>
#define COLS 120
int main(int argc,char** argv){
    GRand* rand = g_rand_new();
    GRand* digit_len_rand = g_rand_new();
    GRand* space_len_rand = g_rand_new();
    guint i = 0,j = 0;
    gchar buf[COLS + 1] = {0};
    for(j = 0; j < 50;j){
            int space_len = g_rand_int_range(digit_len_rand,10,50);
            while(space_len--){
                g_print(" ");
            }
            int digit_len = g_rand_int_range(space_len_rand,10,50);
            gchar* p = buf;
            for(i = 0; i < digit_len;i++){
                g_sprintf(p++,"%d",g_rand_boolean(rand));
            }
            *p = 0;
            g_print("%s\n",buf);
            g_usleep(300000);
    }
    g_rand_free(digit_len_rand);
    g_rand_free(space_len_rand);
    g_rand_free(rand);
    return 0;
}

这个是我在http://blog.这里看到的一个程序在linux下直接编译出现

[root@localhost netga]# gcc test.c
/usr/lib/gcc/i686-redhat-linux/4.4.6/../../../crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status

纯小白一个   求指导啊。。