Calculate area of a rectangle, triangle and circle

Programming tips

Comment

Not putting // before the start of single statement comment is a compiler error. Not putting the */ after the termination of block comment is a compiler error.

Working with switch case

When you are using SWITCH case, it is important to keep in mind that the inclusion of DEFAULT LABEL. This will inform you whether you are executing your program in right or wrong way. So, it is always recommended to use DEFAULT LABEL in the SWITCH st

" ; " after loop

Semoclone ( ; ) is one of the best sensitive symbols in programming. Placing a semicolon ( ; ) after the WHILE or FOR loop is not a syntax error. So it will not be reported by the compiler. However, it is considered to be a logical error as it change

Test expression

The test expression done on exact statement. The good habit of using test expression on exact or fulfill statement. So do not use floating point numbers for checking for equality in the test expression.

Specifer

Specifier is a typedef-name and a very sensitive in C programming. Using an incorrect specifier for the data type being read or written will generate a run time error.

Calculate area of a rectangle, triangle and circle

Solving any mathematical problem there are used some equation. So, to solve our problem we used three equations:

For CIRCLE: Π * radius²

For triangle: 0.5 * height * base

For rectangle: height * width


// AHF C PROGRAM SOLVING

//solving here basic type of programming problem

#include<stdio.h>
#include<math.h>
#define pf printf

int main()
{
    double radius,a,b,height,width,res1=0.0,res2=0.0,res3=0.0;

    //area for circle
    pf("\nEnter value for circle..............");

    pf("\nEnter the radius of the circle: ");
    scanf("%lf",&radius);

    res1=3.1416*radius*radius;


    //area for triangle
    pf("\nEnter value for triangle..............");

    pf("\nEnter the first length: ");
    scanf("%lf",&a);

    pf("\nEnter the second length: ");
    scanf("%lf",&b);

    res2=.5*a*b;


    //area for rectangle
    pf("\nEnter value for rectangle..............");

    pf("\nEnter the height: ");
    scanf("%lf",&height);

    pf("\nEnter the width: ");
    scanf("%lf",&width);

    res3=height*width;



    //total output
    pf("\nThe area of the circle is : %lf",res1);

    pf("\nThe area of the triangle is = %lf",res2);

    pf("\nThe area of the rectangle is = %lf",res3);

    return 0;
}

OUTPUT:

Enter value for circle..............

Enter the radius of the circle: 2.5

Enter value for triangle..............

Enter the first length: 2

Enter the second length: 3

Enter value for rectangle..............

Enter the height: 8

Enter the width: 6

The area of the circle is : 19.635000

The area of the triangle is = 3.000000

The area of the rectangle is = 48.000000