Area of circle and radius are given how to make program

Question

Program in c and java

Answer 1

What are you trying to solve for?

Here is a program in c++ that solves for the area.

#include <iostream>
#include <math.h>

int main()
{
    float r;
    std::cout<<"R = ";
    std::cin>>r;
    
    float p = M_PI;
    
    float s = r*r;
    
    std::cout<<"A = ";
    std::cout<<p*s;
}

Comments

#include <stdio.h>
int main()
{
float r,area;
printf("enter the value of r:");
scanf("%f",&r);
area=3.14*r*r;
printf("area=%f",area);
return 0;
}
//this is the c program

Answer 2

/******************************************************************************

If I understood the question correctly , you want to calculate the

area of circle, if radius is given as input.

*******************************************************************************/
#include <stdio.h>

int main()
{
    printf("Hello World");
    unsigned int r;
    printf("\n Enter radius value");
    scanf("%d",&r);
    printf("\n Area of the circle is %f",(float)(3.14*r*r));
    
    return 0;
}

Answer 3

#include <stdio.h>
main()
{
    int r;
    float area;
    printf("enter the value of r\n");
    scanf("%d",&r);
    area=3.14*r*r;
    printf("the area of circle is: %f",area);
   
   
}

Answer 4

#include<stdio.h>

int main(){

int r=5,a;

float p = 3.14;

a = p* r*r;

printf("%f",a);

return 0;

}

Answer 5

so what you want to calculate because radius is given and area also given if you want to calculate the value of pi then follow this code.........

#include<iostream>

#include<cmath>
using namespace std;

int main()

{

double area,radius,pi;

cout<<"enter the value of area and radius"<<endl;

cin>>area>>radius;

pi=(area)/(radius*radius);

cout<<"the value of pi"<<pi<<endl;
return 0;

}