我自己独立写的第一个C程序，哈哈

/**

 * 获取用户输入的字符串,打印行号

 * skchen @ 2009.08.29 03:03

 */

#include <stdio.h>

#include <stdlib.h>



#define MEM_SIZE 100



void main() {

    //行号

    int line_num = 1;

    //行字符数

    int char_num = 1;

    //行指针

    char *line = NULL;

    //用户输入的字符

    char c;

    //已分配内存大小

    int total_mem_size = 0;

    

    while ((c = getchar()) != EOF && c != '\n') {

        do {

            //看看内存空间是否足够用,要留一位给\0

            if (total_mem_size < char_num) {

                //分配扩大内存空间

                line = realloc(line, total_mem_size + MEM_SIZE);

                if (line == NULL) {

                    printf("动态内存分配错误!程序退出!\n");

                    exit(EXIT_FAILURE);

                }

                //如果分配成功,内存总分配大小加上去

                total_mem_size += MEM_SIZE;

            }

            //把字符给数组

            line[char_num - 1] = c;

            char_num++;

            //继续获取字符

            c = getchar();

            //判断是否回车,如果不是则未结束,继续循环

        } while (c != '\n');

        //添加字符串结束符

        line[char_num - 1] = '\0';

        //打印结果

        printf("line: %d, length: %d, size: %d, string: %s\n", line_num, char_num, total_mem_size, line);

        //释放内存

        free(line);

        //指针重新置为NULL

        line = NULL;

        //内存大小置为0

        total_mem_size = 0;

        //字符长度初始化为1

        char_num = 1;

        //行号+1

        line_num++;

    }

    exit(EXIT_SUCCESS);

}