Write a programe for calculating the area of circle in C programming?

Answer 1

#include

#include

#include

using std::cout;

using std::cin;

using std::endl;

using std::setw();

int main()

{

const double PI = 3.14153;

double radius = 0.0;

cout << "Enter radius of circle: ";

cin >> radius;

unsigned short precision = 5;

cout << endl <<"Enter precision you want have (not more than 6 digits): ";;

cin >> precision;

cout << setw(precision) <

system("PAUSE");

return 0;

}

Answer 2

#include<stdio.h>

main()

{

float r,area;

printf("Enter radius\n");

scanf("%f",&r);

area=3.14*r*r;

printf("area=%f",area);

}

Answer 3

Dude, we're not going to do your programming homework. If you really just want to know, I'm sure there are any number of sample programs on the internet.