C program for " The length and breadth of a rectangle and radius of a circle are input through keyboard. write a program to calculate the area and perimeter of a rectangle, and the area and circumference of the circle."

Problem: C program for " The length and breadth of a rectangle and radius of a circle are input through keyboard. write a program to calculate the area and perimeter of a rectangle, and the area and circumference of the circle."

Formulae used:

Area of rectangle + Length x Breadth

Perimeter of rectangle = 2 x ( length + breadth )

Circumference of circle = 2 x PI x radius of circle

Area of circle = PI x radius of circle x radius of circle

C program:

// Program by Shyam Kanth.

#include<stdio.h>

int main(){

    float l,b,r,arear,areac,circum,per,pi;

    pi=3.14;

    printf("Enter the length of rectangle : ");

    scanf("%f",&l);

    printf("Enter the breadth of rectangle : ");

    scanf("%f",&b);

    printf("Enter the radius of circle : ");

    scanf("%f",&r);

    arear=l*b;

    per=2*(l+b);

    areac=pi*r*r;

    circum=2*pi*r;

    printf("Area of rectangle is %.2f.\n",arear);

    printf("Perimeter of rectangle is %.2f.\n",per);

    printf("Area of circle is %.2f.\n",areac);

    printf("Circumference of circle is %.2f.\n",circum);

    return 0;

}

Codes used:

• #include < stdio.h > : Header file for input output
• int : Integer data type
• float : Decimal data type
• l,b,r,arear,areac,circum,per,pi : Variable used
• 3.14 : Value of pi
• printf : Function for displaying message 
• scanf : Function for taking input

Do comment, if any doubt

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