C Exercises: Compute the perimeter and area of a rectangle

Last update on May 27 2022 12:14:23 (UTC/GMT +8 hours)

C Basic Declarations and Expressions: Exercise-6 with Solution

Write a C program to compute the perimeter and area of a circle with a given radius.

C programming: Area and circumference of a circle

In geometry, the area enclosed by a circle of radius r is πr2. Here the Greek letter π represents a constant, approximately equal to 3.14159, which is equal to the ratio of the circumference of any circle to its diameter.

The circumference of a circle is the linear distance around its edge.

Pictorial Presentation:

c programming area and perimeter of a circle

Why is the area of a circle of a circle pi times the square of the radius?

C Code:

#include <stdio.h> 
int main() {
   int radius;
   float area, perimeter;    
   radius = 6;

   perimeter = 2*3.14*radius;
   printf("Perimeter of the Circle = %f inches\n", perimeter);
	
	area = 3.14*radius*radius;
	printf("Area of the Circle = %f square inches\n", area);

return(0);
}

Sample Output:

Perimeter of the Circle = 37.680000 inches                             
Area of the Circle = 113.040001 square inches

Flowchart:

C Programming Code Editor:

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP