Force input to be positive numbers only with error handling in C

Question

I have a trivial question to ask. My program should take postive integers only. If there is anything illegal, the user should be prompted to input a number again.

Th

Answer 1

while(num<=0){
  printf("Please Enter positive integer: ");
  while(((reads = scanf("%d%c", &num, &a)) != 2 && reads != EOF) || a != '\n' ){
    printf("Please Enter positive integer: ");
    while(getchar() != '\n');
  }
}