Question

Given a text, check if all vowels appear in the text. Use while loop , getchar and no arrays. C language

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

int main()
{
  char ch;
  int A = 0, E = 0, I = 0, O = 0, U = 0;

  printf("Enter text ('|' to terminate):\n");

  ch = getchar();
  while (ch != '|')
  {
    ch = tolower(ch);
    if (ch == 'a')
      A = 1;
    else if (ch == 'e')
      E = 1;
    else if (ch == 'i')
      I = 1;
    else if (ch == 'o')
      O = 1;
    else if (ch == 'u')
      U = 1;
    
    ch = getchar();
  }

  if (A && E && I && O && U)
    printf("TRUE");
  else
    printf("FALSE");

  return 0;
}

Note: The getchar() is used to read inputs from stdin. Hence it used to read text from input stream.