Sentinel Controlled Loops

Instructions:

    Write a program that will have the user enter a letter.

• If the letter is a vowel, the output will report that the user has entered letter ??? and that it is a vowel.
• Otherwise, the output will report that the user has entered letter ??? and asks them to please enter a vowel.
• The program will run until the user enters x.
• The user may enter the letter in either uppercase or lowercase and the program will execute properly.
  

  
Solution:

#include <stdio.h>

#include <stdlib.h>

#include <ctype.h>

int main()

{

char ch, tmpCh;

printf("*********Welcome to Program**********\n");

printf("Enter the Char: \n");

scanf(" %c", &ch);

tmpCh = (toupper(ch));

while (tmpCh != 'X')

{

if (!isalpha(ch) || (int)ch == 45)

{

printf("Please Enter Valid Char.\n");

printf("\nPlease press any key to continue: ");

char reCh;

reCh = getc(stdin);

if (reCh == 10)

{

reCh = getc(stdin);

}

system("clear");

printf("*********Welcome to Program**********\n");

printf("Enter the Char: \n");

scanf(" %c", &ch);

tmpCh = (toupper(ch));

}

else

{

if (tmpCh == 'A' || tmpCh == 'E' || tmpCh == 'I' || tmpCh == 'O' || tmpCh == 'U')

{

printf("You have enter Valid Vowel which is %c \n", ch);

printf("\nPlease press any key to continue: ");

char reCh;

reCh = getc(stdin);

if (reCh == 10)

{

reCh = getc(stdin);

}

system("clear");

printf("*********Welcome to Program**********\n");

printf("Enter the Char: \n");

scanf(" %c", &ch);

tmpCh = (toupper(ch));

}

else

{

printf("You have enter letter which is not Vowel which is %c \n", ch);

printf("\nPlease press any key to continue: ");

char reCh;

reCh = getc(stdin);

if (reCh == 10)

{

reCh = getc(stdin);

}

system("clear");

printf("*********Welcome to Program**********\n");

printf("Enter the Char: \n");

scanf(" %c", &ch);

tmpCh = (toupper(ch));

}

}

}

return 0;

}