自动输出行号和内容

#include <stdio.h>

#include <stdlib.h>

int main()

{

int ch;

int lin;

int t_beginning;

lin = 0;

t_beginning = 1;

while ((ch = getchar()) != EOF)

{

 if(t_beginning == 1)

 {

   t_beginning = 0;

  lin++;

  printf("%d.",lin);

 }

 putchar(ch);

 if( ch == '\n')

  t_beginning = 1;

}

return EXIT_SUCCESS;

}