Question

I have a simple program test which gets a number as input and prints the same on console.

#include<stdio.h>
int main(void)
{
   int i;
   printf("Test Pgm \n");
   printf("Enter a no:");
   scanf("%d",&i);
   printf("No Inputted:%d \n",i);
   return 0;
}

//The above program lies on 10.220.5.xx (different machine)

##gcc -o test test.c

On invoking the test pgm frm another machine over ssh , I don’t get any prompt on the machine where im executing.

$ ssh [e-mail] '/home/user/test'
[e-mail]'s password

After entering the password i don’t get see anything not even ‘Test Pgm’. How do i get the prompt remotely and input the values?

Answer 1

Try adding fflush(stdout); before the scanf().

Also, you must check the return value of scanf(), it can fail to convert the input if given non-numerical text:

fflush(stdout);
if(scanf("%d", &i) == 1)
  printf("Number input: %d\n", i);