c - C 编程 : Exit endless loop if written inside

Question

如果添加新关系，我需要退出此循环!只要它是空的或者按下“Enter”键，它就需要继续下去。

CODE:
static char input[100];

int main()
{
  printf("Press Ctrl+c to Exit!\n");
  while(1)
  {
    //Input (stdin) and output (stdout) declared in <stdio.h> library
    fputs("esp>", stdout);
    fgets(input,100,stdin);

    if(input != 0) //here I can not change it !!!
      return 1;
  }
return 0; 
}

输出:

Press Ctrl+c to Exit!
esp> (If "enter" is pressed) keep going
esp>
esp> s ( if something wrong is written, exit) else, keep going

Answer 1

如果您只想检查是否有空输入，请尝试此操作？

while(1)
{
    fputs("esp> ", stdout );
    fgets( input, 100, stdin );

    if( input[0] != '\n' && strlen(input) )
    {
        // Do something with input
    }
}