C How to ignore empty lines in user input? -

here current code:

int num = 0; char c = '#';  scanf("%d",&num); do{     (int i=0;i<num;i++){         printf("%c",c);     }     printf("\n"); } while (scanf("%d", &num) == 1); 

how have if user doesn't enter anything, program won't spit out newline?

any appreciated, thank you!

this code should work want :

#include <stdio.h>  int main() {     int num = 0;     char c = '#';     char readline[50];      while ((fgets(readline, sizeof readline, stdin) != null) && sscanf(readline, "%d", &num) == 1)     {         (int i=0;i<num;i++){                 printf("%c",c);         }         printf("\n");         fflush(stdout);     }     return 0; } 

the behaviour of code following : fgets read enter in standard stream (stdin), , put in readline array. program try read number in readline variable , put in num variable sscanf function. if number read, program execute behaviour did present in question (writing # character "num" times), , go beginning of loop. if else number has been read, loop stopped.