C Programming Code Examples C > Mathematics Code Examples Calculation: divide, product and PI Calculation: divide, product and PI /* calculations on a table */ #include <stdio.h> void main() { float r = 0.0f; /* The radius of the table */ float d = 4.0f; /* The diameter of the table */ float c = 0.0f; /* The circumference of the table */ float area = 0.0f; /* The area of a circle */ float Pi = 3.14159265f; r = d/2.0f; /* Calculate the radius */ c = 2.0f*Pi*r; /* Calculate the circumference */ area = Pi*r*r; /* Calculate the area */ printf("\nThe circumference is %.2f", c); printf("\nThe area is %.2f\n", area); }