C program to check whether input alphabet is a vowel or not

#include <stdio.h>
 
int main()
{
  char ch;
 
  printf("\nEnter a character:");
  scanf("%c", &ch);
 
  if (ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || 

  ch == 'i' || ch == 'I' || ch =='o' || ch=='O' || ch == 'u' 

  || ch == 'U')

  printf("%c is a vowel\n", ch); 

  else 

  printf("%c is not a vowel.\n", ch);
  return 0;
}

Output:

 Enter a character : e

 e is a vowel 

 Enter a character : w

 w is not a vowel 

C++ Program to Reverse a Number

#include<iostream>
using namespace std;

int main() {
int number, reverse = 0;
cout<<"Input a Number to Reverse and press Enter: ";
 cin>> number;     // Taking Input Number in variable number

   for( ; number!= 0 ; )
   {
      reverse = reverse * 10;
      reverse = reverse + number%10;
      number = number/10;
   }
   cout<<"New Reversed Number is:  "<<reverse;
   return 0;

}

Output: 

  Input a Number to Reverse and press Enter:12345
  New Reversed Number is:54321

C++ Program to enter two integers and find their Sum and Average

#include <iostream.h> 

#include <conio.h>

void main() 

{ 

clrscr(); 

int x,y,sum; 

float average; 

cout << "Enter 2 integers : " << endl; 

cin>>x>>y; 

sum=x+y; 

average=sum/2; 

cout << "The sum of " << x << " and " << y << " is " << sum 

     << "." << endl; 

cout << "The average of " << x <<  " and " << y << " is " << average 

     << "." << endl; 

getch(); 

}

Output:

The sum of 8 and 6 is 14
The average of 8 and 6 is 7

C program to Find the Prime Number

#include<stdio.h>
 
int main()
{
   int n, i = 3, count, c;
 
   printf("Enter the number of prime numbers required\n");
   scanf("%d",&n);
 
   if ( n >= 1 )
   {
      printf("First %d prime numbers are :\n",n);
      printf("2\n");
   }
 
   for ( count = 2 ; count <= n ;  )
   {
      for ( c = 2 ; c <= i - 1 ; c++ )
      {
         if ( i%c == 0 )
            break;
      }
      if ( c == i )
      {
         printf("%d\n",i);
         count++;
      }
      i++;
   }
 
   return 0;
}

Output:

 Enter the number of prime numbers require

  5

 First 10 Prime Numbers are:

  2

  3

  5

  7 

  11