Here, we  declared three floating point numbers, to scan user inputs, and to store and display the values after calculation. Displayed a note to the user to enter radius, scanned through the function which is in the included header library “stdio.h”. Area and the circumference are calculated as discussed.

#include<stdio.h>
void main()
{
float area, radius, circum;
clrscr();
printf(“\n\n\t ENTER THE RADIUS OF THE CIRCLE…:”);
scanf(“%f”, &radius);
area = 3.142 * radius * radius;
circum = 2 * 3.142 * radius;
printf(“\n\n\t THE AREA OF THE CIRCLE IS…: %f”, area);
printf(“\n\n\t THE CIRCUMFERENCE OF THE CIRCLE IS…: %f\n”, circum);
getch();
}

Download exe and source code here.

The post To calculate area and circumference of the circle first appeared on Student Projects.