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A C program to print the average of the numbers(Using While Loop) 

Below is a program to print the average of two numbers that are input through the keyboard. 
 
/* Read the numbers from the keyboard as input and
 * print out their average as output.  */ 
 
#include &lt stdio &gt
int main( )
{
   double x = 0.0, sum = 0.0;
   int count = 0;

   printf( "\t--- Calculate Average of the numbers ---\n" );
   printf( "\nEnter the number you want to calulate average for:\n"
           "(Type a letter to end your input)\n" );
   while ( scanf( "%lf", &x ) == 1 )
   {
      sum += x;
      ++count;
   }
   if ( count == 0 )
     printf( "No input data given!\n" );
   else
     printf( "The average of given numbers is %.2f\n", sum/count );
   return 0;
}
The output of the program:
 
 
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