C program to show use of User Defined Functions.

This program demonstrate use of FindAverage() function.

#include<stdio.h>

void FindAverage(); // function prototype declaration.

int main()

{

     FindAverage(); //Call function.
     return 0;

}

void FindAverage()

{

     //function logic is written here..

     float num1, num2;

    

     printf("Enter number1: ");

     scanf("%f",&num1);

    

     printf("Enter number2: ");

     scanf("%f",&num2);

    

     printf("Average of two numbers: %f.", (num1+num2)/2);    

}

//Output

Enter number1: 10

Enter number2: 20

Average of two numbers: 15.000000.

C program to show use of sqrt() Library Functions.

This program demonstrate use of two library function:

--> sqrt()

--> printf()

*/

#include<stdio.h>

#include<math.h>

void main()

{

     float ans;

     ans = sqrt(100);

    

     printf("The square root of 100 is %f.", ans);  

}

//Output

The square root of 100 is 10.000000.

C program to use Arrow keys.

This program explains how to use Arrow keys in C program.

#include<stdio.h>
int main()
{
 int chr1, chr2;
 printf("Press any arrow key...\n");
 chr1 = getch();
 if (chr1 == 0xE0) //to check scroll key interrupt
 {
  chr2 = getch();  //to read arrow key
  switch(chr2)
  {
   case 72: printf("UP ARROW KEY PRESSED\n");
      break;
   case 80: printf("DOWN ARROW KEY PRESSED\n");
      break;
   case 75: printf("LEFT ARROW KEY PRESSED\n");
      break;
   case 77: printf("RIGHT ARROW KEY PRESSED\n");
      break;
   default: printf("OTHER KEY PRESSED: %d %d\n", chr1, chr2);
      break;
  };
 }
 return 0;
}

Output of program

Press any arrow key...
UP ARROW KEY PRESSED