C Program to calculate frequency of vowels in a string

/********************************************************************** 

C Program to calculate frequency of vowels in a string

 **********************************************************************/

#include <stdio.h>

#include <conio.h>

void main()

{

  int a=0,e=0,i=0,o=0,u=0,sum=0;

  char c;

  printf("Enter string:-  ");

  printf("\nString will be terminated if you press Ctrl-Z & then ENTER.");

  printf("\nSTRING:-  ");

  while ((c=getchar())!=EOF)

    {

      if (c=='a'||c=='A')

        a=a+1;

      if (c=='e'||c=='E')

        e=e+1;

      if (c=='i'||c=='I')

        i=i+1;

      if (c=='o'||c=='O')

        o=o+1;

      if (c=='u'||c=='U')

        u=u+1;

    }

  sum=a+e+i+o+u;

  printf("\nFrequency of vowel 'a' is %d.",a);

  printf("\nFrequency of vowel 'e' is %d.",e);

  printf("\nFrequency of vowel 'i' is %d.",i);

  printf("\nFrequency of vowel 'o' is %d.",o);

  printf("\nFrequency of vowel 'u' is %d.",u);

  printf("\nTotal no. of vowels in the text is %d.",sum);

}

/*

OUTPUT:

Enter string:-

String will be terminated if you press Ctrl-Z & then ENTER.

STRING:-  weghwehfgwwwpqezrhdnxmy,aldhfbvgctesvdchxmakwqpriuzttrewqasdgfhjklmynxc

Frequency of vowel 'a' is 3.

Frequency of vowel 'e' is 5.

Frequency of vowel 'i' is 1.

*/

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Here is the source code of the C program to display a linked list in reverse. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

1. /*

2.  * C Program to Print Binary Equivalent of an Integer using Recursion

3.  */

4. #include <stdio.h>

5. int binary_conversion(int);

6. int main()

7. {

8.    int num, bin;

9.    printf("Enter a decimal number: ");

10.    scanf("%d", &num);

11.    bin = binary_conversion(num);

12.    printf("The binary equivalent of %d is %d\n", num, bin);

13. }

14. int binary_conversion(int num)

15. {

16.     if (num == 0)

17.     {

18.         return 0;

19.     }

20.     else

21.     {

22.         return (num % 2) + 10 * binary_conversion(num / 2);

23.     }

24. }

25. }

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$ gcc binary_recr.c -o binary_recr
$ a.out
Enter a decimal number: 10
The binary equivalent of 10 is 1010

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