How to find circle area using πr ² formula in C

πr² is a common formula to us.But can you find a circle area value by C?
if not,try this.It's help you to know how to find/print the value of a circle 
area in C programming language.


Code to print the value:


#include<stdio.h>
#define PI 3.1416

int main()
{
    float circle_area, r;

    printf("Enter the value of radius: \n");
    scanf("%f", &r);

    circle_area = PI *r * r;

    printf("The circle area is: %.2f\n", circle_area);


return 0;

}


OR,


#include<stdio.h>


int main()
{
    float circle_area, r, PI=3.1416;

    printf("Enter the value of radius: \n");
    scanf("%f", &r);

    circle_area = PI * r * r;

    printf("The circle area is: %.2f\n", circle_area);


return 0;

}

The Output is:

Face problems?No problem.You can share your problems by commenting below.or you can leave a massage us.Thank you.

make a currency converter By C programming language

We can make a simple currency converter by C programming language.

Lets see the code:

#include <stdio.h>
double convert(void);
int main(void){

    double taka;

    taka=convert();
    printf("In taka= %0.2lf\n",taka);

    return 0;
}

double convert(void)
{
    double dollars,multi_value;
    multi_value=80.0;

    printf("enter dollar amount: \n");
    scanf("%lf", &dollars);

    return dollars*multi_value;

}

Output:

It is really great.But if you face any problem or have any question,please comment below.