Question

In C Language

Write a program that reads characters from scanf1 (keyboard) and gives the number of vowels (lower case) entered, stopping when ‘q’ has been entered. Construct three versions of this program, using the while, do-while, and for loops.

3 different version

Answer 1

Version 1 code:

#include<stdio.h>

void main(){
    char chr = 'm'; // variable to store the character, here we can use cahr value to any thing other than q 
    int   count;  // variable to store number of vowels
    while (chr != 'q'){ // while loop count vowels
        printf("Enter a character(q to quit): \n"); //  message
        scanf(" %c", &chr); // usr input
        if( chr == 'a'|| chr == 'e'|| chr == 'i'|| chr == 'o'|| chr == 'u'){ // check if charcter is vowels
            count++; // update count variable
        }
    }
    printf("Total number of vowels are: %d\n", count); // print the vowels

}

Sample Screenshot:

root@kali:-/code# gcc version1.c -o version1 root@kali:-/code# -/version1 Enter a character(q to quit): а Enter a character(q to quit): е Enter a character(q to quit): t Enter a character(q to quit): CD t 0 Enter a character(q to quit): q Total number of vowels are: 3 root@kali:-/code# |

Version2 :

#include<stdio.h>

void main(){
    char chr = 'm'; // variable to store the character, here we can use cahr value to any thing other than q 
    int   count;  // variable to store number of vowels
  for(;;) {   // for loop count vowels
        printf("Enter a character(q to quit): \n"); //  message
        scanf(" %c", &chr); // usr input
        if( chr == 'a'|| chr == 'e'|| chr == 'i'|| chr == 'o'|| chr == 'u'){ // check if charcter is vowels
            count++; // update count variable
        }
    if (chr == 'q'){
        printf("Total number of vowels are: %d\n", count); // print the vowels
        return;
    }
    }
}

sample screenshot:

root@kali:-/code# gcc version2.c -o version2 root@kali:-/code# -/version2 Enter a character(q to quit): W Enter a character(q to quit): e Enter a character(q to quit): t Enter a character(q to quit): u Enter a character(q to quit): i Enter a character(q to quit): a Enter a character(q to quit): 0 Enter a character(q to quit): a Enter a character(q to quit): a Total number of vowels are: 6 root@kali:-/code# I

Version 3:

#include<stdio.h>

void main(){
    char chr = 'm'; // variable to store the character, here we can use cahr value to any thing other than q 
    int   count;  // variable to store number of vowels
  do {   // do loop count vowels
        printf("Enter a character(q to quit): \n"); //  message
        scanf(" %c", &chr); // usr input
        if( chr == 'a'|| chr == 'e'|| chr == 'i'|| chr == 'o'|| chr == 'u'){ // check if charcter is vowels
            count++; // update count variable
        }
    }while (chr != 'q');
    printf("Total number of vowels are: %d\n", count); // print the vowels

}

Sample output:

root@kali:-/code# gcc version1.c -o version1 root@kali:-/code# -/version1 Enter a character(q to quit): a Enter a character(q to quit): у Enter a character(q to quit): i Enter a character(q to quit): 0 Enter a character(q to quit): r Enter a character(q to quit): t Enter a character(q to quit): a Total number of vowels are: 3 root@kali:-/code# I

Note: Please let me know if you have any doubt.