1. Calculate the area and circumference of a circle.

    #include<stdio.h>
    #define PI 3.14285714

    int main()
    {
        float radius,area,circum;
        printf("Enter the Radius of the Circle:");
        scanf("%f",&radius);
        area=PI*radius*radius;
        circum=2*PI*radius;
        printf("Area of the Circle is %f",area);
        printf("\nCircumference of the Circle is %f:",circum);
        return(0);
    }