Calculate area, circumference & radius of circle in C language.

Let’s understand some concept.

In this programme, calculate the area, circumference & radius of the circle by using mathematical formula. Area =pie*r*r, The circumference =2*pie*r. Other are made by this. Here is so simple concept..

Calculate the area of circle by entering the radius of circle

Some important symbols used in code.

• () small bracket
• && use for ‘and’ use for address
• {} curly bracket
• “” double code

1. #include<studio.h>
2. #include<conio.h>
3. void main()
4. {
5. float pie=3.14, r, area;
6. clrscr();
7. printf(“Enter the radius of circle to calculate the area”);
8. scanf(“%f”, &r);
9. area=pie*(r*r);
10. printf(“area of the circle = %f”, area);
11. getch();
12. }

Inputs..

If r= 50 then

Results..

Calculate the radius by entering the area of the circle.

• #include<studio.h>
• #include<math.h>
• int main()
• {
• float pie=3.14,r,area,radius;
• printf(“Enter the Area of circle”);
• scanf(“%f”, &area);
• r=area/pie;
• radius=sqrt(r);
• printf(“radius Of the circle =%f”, radius);
• return 0;
• }

Inputs..

If area =123

Results..

Calculate the circumference of circle by entering the radius of circle

1. #include<studio.h>
2. #include<conio.h>
3. void main()
4. {
5. float pie=3.14, r, circum;
6. clrscr();
7. printf(“Enter the radius of circle to calculate the circumference of the circle”);
8. scanf(“%f”, &r);
9. circum=2*pie*r;
10. printf(“circumference of the circle = %f”, circum);
11. getch();
12. }

Inputs..

If r=50 then

Results..

Calculate the radius by entering the circumference of the circle.

1. #include<studio.h>
2. #include<conio.h>
3. void main()
4. {
5. float pie=3.14, r, circum;
6. clrscr();
7. printf(“Enter the circumference of circle to calculate the radius of the circle”);
8. scanf(“%f”, &circum);
9. r=circum/2*pie;
10. printf(“radius of the circle = %f”, radius);
11. getch();
12. }

Inputs..

If circum =314 then

Results..

Radius = 50