C Programs

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C Program: Surface Area of a Cylinder

Introduction (Cylinder Surface Area)

A cylinder is a 3D solid shape with two parallel circular bases connected by a curved surface.
Examples in real life include cans, pipes, and water tanks.

The surface area of a cylinder has two parts:

1. Curved Surface Area (CSA): 2πrh
2. Total Surface Area (TSA): 2πr (r + h)

where

• r = radius of the base
• h = height of the cylinder
• π (pi) ≈ 3.14159

In this program, we calculate the Total Surface Area (TSA).

C Program: Surface Area of a Sphere

#include <stdio.h>
#define PI 3.14159   // Define constant PI
 
int main() {
    float radius, height, surface_area;
 
    // Input radius and height
    printf("Enter the radius of the cylinder: ");
    scanf("%f", &radius);
 
    printf("Enter the height of the cylinder: ");
    scanf("%f", &height);
 
    // Calculate total surface area
    surface_area = 2 * PI * radius * (radius + height);
 
    // Display result
    printf("Surface Area of Cylinder = %.2f\n", surface_area);
 
    return 0;
}
 

 
OUTPUT 1 :
Enter the radius of the cylinder: 5
Enter the height of the cylinder: 10
Surface Area of Cylinder = 471.24


OUTPUT 2 :
Enter the radius of the cylinder: 3.5
Enter the height of the cylinder: 8
Surface Area of Cylinder = 254.47

Explanation

1. The program takes radius and height as input.
2. Formula applied: 2 × π × r × (r + h).
3. PI is defined using #define.
4. Output is displayed with two decimal precision.