Write a function that calculates the area of a circle.

#include <stdio.h>

float circle(float radius) {
    float area;
    area = 3.14 * radius * radius; 
    return area;
}

int main() {
    float radius, area;

    printf("Enter the radius: ");
    scanf("%f", &radius);

    area = circle(radius);

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

    return 0;
}