#include <stdio.h>
#include <stdlib.h>
#include <string.h>
const size_t BUFFER_LEN = 6;
const size_t NUM_P = 2;

int main( void )
{
    char buffer[BUFFER_LEN];
    char *ps[NUM_P];
    char *pbuffer = buffer;
    int i;
    for ( i = 0; i < NUM_P; i++ ) ps[i] = NULL;
    printf( "\nYou can enter up to %u messages each up to %u characters.",
            NUM_P, BUFFER_LEN - 1 );
    for ( i = 0; i < NUM_P; i++ ) {
        pbuffer = buffer;
        printf( "\nEnter %s message, or press Enter to end\n",
                i > 0 ? "another" : "a" );
        while ( ( pbuffer - buffer < BUFFER_LEN ) &&
                ( ( *pbuffer++ = getchar() ) != '\n' ) );
        if (*(pbuffer-1) == '\n') {
            *(pbuffer-1) = 0;
            if ( ( pbuffer - buffer ) < 2 )
                break;
        } else if ( ( pbuffer - buffer ) >= BUFFER_LEN ) {
            printf( "String too long - maximum %d characters allowed.",
                    BUFFER_LEN );
            i--;
            continue;
        } else *pbuffer++ = 0;
        ps[i] = ( char * )malloc( pbuffer - buffer );
        if ( ps[i] == NULL ) {
            printf( "\nOut of memory - ending program." );
            return 1;
        }
        strcpy( ps[i], buffer );
    }
    printf( "\nIn reverse order, the strings you entered are:\n" );
    while ( --i >= 0 ) {
        printf( "\n%s", ps[i] );
        free( ps[i] );
        ps[i] = NULL;
    }
    printf( "\n\n" );
    return 0;
}

现修改如上。今天头脑好像有些晕乎，见谅。


[ 本帖最后由 top398 于 2014-5-13 17:24 编辑 ]

测试结果：

R:\>a

You can enter up to 2 messages each up to 5 characters.
Enter a message, or press Enter to end
abcde

Enter another message, or press Enter to end
fghij

In reverse order, the strings you entered are:

fghij
abcde


R:\>a

You can enter up to 2 messages each up to 5 characters.
Enter a message, or press Enter to end
abcdefghijklmn
String too long - maximum 6 characters allowed.
Enter a message, or press Enter to end
String too long - maximum 6 characters allowed.
Enter a message, or press Enter to end

Enter another message, or press Enter to end
12345

In reverse order, the strings you entered are:

12345
mn

getchar()并非一个理想的键盘输入函数，因为它是基于缓冲区的，只有当按下回车时才回馈给请求输入的程序。

非常感谢你耐心细致的回复，群里的高手很多，大多不屑于回复我们这些菜鸟的低级问题，即使回复也是三言两语，雾里看花，由衷敬佩你不吝指教的精神，希望以后有问题还能向你请教！

对，就是这帮高手的事，回复还不好好回复，三言两语的

楼主厉害！解答了我心中的疑问。