1.8.2

#include <stdio.h>
int main(void)
{
    int line = 1;
    int inline = 1;
    int ch;
    while( ( ch = getchar() ) != EOF)
    {
        if(inline)
        {
            printf("第%d行：",line++);
            inline = 0;
        }
        putchar( ch );
        if( ch == '\n')
        inline = 1;
    }
    return 0;
}