# C program to find the area of circle and cylinder using structures.

CServer Side ProgrammingProgramming

In C programming language, we can find the area of circle, area and volume of cylinder with the help of structures.

• The logic used to find area of circle is as follows −
s.areacircle = (float)pi*s.radius*s.radius;
• The logic used to find area of cylinder is as follows −
s.areacylinder = (float)2*pi*s.radius*s.line + 2 * s.areacircle;
• The logic used to find the volume of cylinder is −
s.volumecylinder = s.areacircle*s.line;

## Algorithm

Refer an algorithm given below to find the area of circle and cylinder along with other parameters by using structures.

Step 1 − Declare structure members.

Step 2 − Declare and initialize the input variables.

Step 3 − Enter length and radius of cylinder.

Step 4 − Compute area of circle.

Step 5 − Compute area of cylinder.

Step 6 − Compute volume of cylinder.

## Example

Following is the C program to find the area of circle and cylinder along with other parameters by using structures −

Live Demo

#include<stdio.h>
struct shape{
float line;
float areacircle;
float areacylinder;
float volumecylinder;
};
int main(){
struct shape s;
float pi = 3.14;
//taking the input from user
printf("Enter a length of line or height : ");
scanf("%f",&s.line);
printf("Enter a length of radius : ");
//area of circle
printf("Area of circular cross-section of cylinder : %.2f\n",s.areacircle);
//area of cylinder
s.areacylinder = (float)2*pi*s.radius*s.line + 2 * s.areacircle;
printf("Surface area of cylinder : %.2f\n", s.areacylinder);
//volume of cylinder
s.volumecylinder = s.areacircle*s.line;
printf("volume of cylinder : %.2f\n", s.volumecylinder);
return 0;
}

## Output

When the above program is executed, it produces the following output −

Enter a length of line or height: 34
Enter a length of radius: 2
Area of circular cross-section of cylinder: 12.56
Surface area of cylinder: 452.16
volume of cylinder : 427.04