This post contains a total of 6+ C Program Examples with Source Code to Calculate the Area of a Circle. All these Circle Area Calculator programs are made using C Language.
You can use the source code of these examples with credits to the original owner.
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C PROGRAMS TO CALCULATE AREA OF CIRCLE
1. By Sadhvik Morla
Made by Sadhvik Morla. Simple Program to find the Area of a circle. Source
10 area of circle of radius 10 = 314.159210
#include <stdio.h>
int main()
{
int r;
float area;
scanf("%d",&r);
area=3.141592*r*r;
printf("area of circle of radius %d = %f",r,area);
}
2. By Junior Rido
Made by Junior Rido. Write your Circle radius in redius column to get its area. Source
33 The area of circle is 3419.460205
#include <stdio.h>
int main() {
int redius = 33 ;
float ฯ = 3.14;
printf ("The area of circle is %f", ฯ*redius*redius);
return 0;
}
3. By Sriram Kummari
Made by Sriram Kummari. Basic C Program to Calculate the Area of a Circle. Source
Enter Radius: 40 Area : 5024.00
#include<stdio.h>
int main()
{
float area,radius;
printf("Enter Radius:");
scanf("%f",&radius);
area=3.14*radius*radius;
printf("Area : %6.2f",area);
return (0);
}
4. By Gaurav Gunwant
Made by Gaurav Gunwant. Enter your input circle radius in “r = “. Source
314.000000
#include <stdio.h>
int main() {
int r;
float pi,area;
r=10;
pi=3.14;
area=pi*r*r;
printf("%f",area);
return 0;
}
5. By Monalisa
Made by Monalisa. This C program calculates the area and the perimeter of a circle. Source
enter the radius 33 area=13068 and perimeter=198
#include <stdio.h>
int area (int);
int cir (int);
extern int pi = 3.141;
int main()
{
int r,ar,cr;
printf ("enter the radius\n") ;
scanf("%d",&r);
ar=area(r);
cr=cir(r);
printf ("area=%d and perimeter=%d",ar,cr);
return 0;
}
int area(int r)
{
int a;
a=4*pi*r*r;
return a;
}
int cir (int r)
{
int p;
p=2*pi*r;
return p;
}
6. By partha dutta
Made by partha dutta. Program to find area of a circle and triangle using Function. Source
12 452.160004
#include <stdio.h>
#define PI 3.14
int main() {
float r,b,h;
void circle(float *x);
void triangle(float *y,float *z);
scanf("%f",&r);
scanf("%f%f",&b,&h);
circle(&r);
triangle(&b,&h);
return 0;
}
void circle(float *x)
{
float area1;
area1=PI*(*x)*(*x);
printf("%f\n",area1);
}
void triangle(float *y,float *z)
{
float area2;
area2=(*y/2)*(*z/2);
printf("%f\n",area2);
}
7. By Sukanya
Made by Sukanya. Program to find area of circle and rectangle. Source
Enter c for circle or r for rectangle c 10 The area is 314.000000 ,the circumference is 62.799999
#include <stdio.h>
int main() {
char c,r,a;
float area, circumference,perimeter;
printf("Enter c for circle or r for rectangle\n");
scanf("%c",&a);
if(a=='c')
{
float radius;
scanf("%f",&radius);
area=3.14*radius*radius;
circumference =2*3.14*radius;
printf("The area is %f ,the circumference is %f",area,circumference);
}
else if(a=='r')
{
float l,b;
scanf("%f %f",&l,&b);
area=l*b;
perimeter=2*(l+b);
printf("The area is %f and perimeter is %f\n",area,perimeter);
}
return 0;
}