C Program: Enter the Radius of circle and Find out its Area and Perimeter

Statement of C program: Enter the radius of a circle and prints its 

1. Area
2. Perimeter

1. Area of Circle:

#include<stdio.h>

#include<conio.h>

void main()

{

float radius , area;              

float PI=3.142 ;

clrscr();

printf(" Enter the radius\n");

scanf("%f" , &radius);

area= PI * radius * radius ;

printf(" Area of circle=%f\n " , area);

printf(" Perimeter=%f\n" , pmeter);

getch();

}

Output:

Enter the radius

7

Area of circle= 154 44 44

2. Perimeter of Circle:

#include<stdio.h>

#include<conio.h>

void main()

{

float radius , pmeter;               // pmeter stands for perameter of circle.

float PI=3.142 ;

clrscr();

printf(" Enter the radius\n");

scanf("%f" , &radius);

pmeter = 2* PI * radius;

printf(" Area of circle=%f\n " , area);

printf(" Perimeter=%f\n" , pmeter);

getch();

}

Output:

Enter the radius

7

Perimeter of circle= 4444