Ex: write a C program to find Area of the circle. How to write a C program to find area of circle. C program to find area of circle. Input from user: Enter the radius of the circle: 5 Expected Output: Area of circle is: 78.500000 To find area of circle we need to use pi(π). Because pi(π) representsthe ratio of the circumference of a circle to its diameter.

Step by step logic of the program: 1. First we need to declare two variable's. One for accepting radius of the circle from user and second one is for store the area of circle. 2. So declare variable's r for radius of the circle and a for area of the circle. 3. To find area use area of circle's simple logic which π*r^2(pi r square). 4. Here pi's value is 3.14. so we will write a=3.14*r*r.(here r=5) 5. Last we will print value of a(area of circle) on the output screen.

Program: #include<stdio.h> intmain() { int r; float a; printf("enter the radius of the circle:\n"); scanf("%d",&r); a=3.14*r*r; printf("Area of circle is %f",a); return 0; } Above program shows the following output:

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