how to calculate Area of Circle | In C

Practice Program

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Calculate area of the circle?By taking radius from the user.

void main()
{
    float r,Area;
    //Area of circle = 3.14*radius*radius


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


    Area = 3.14*(r*r);

    printf("\nArea of circle is %f",Area);


}

Output1

Enter radius of the circle:1.2
Area of the circle is 4.521600.

Output2

Enter radius of the circle:2
Area of the circle is 12.560000.

Output3

Enter radius of the circle:4.6
Area of the circle is 66.442398.

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