C examples for Language Basics:Constant
Use a const to define constant value
#include <stdio.h> int main(void) { float diameter = 0.0f; // The diameter of a table float radius = 0.0f; // The radius of a table const float Pi = 3.14159f; // Defines the value of Pi as fixed printf("Input the diameter of a circle:"); scanf("%f", &diameter); radius = diameter/2.0f;/*from ww w .j a va 2 s .co m*/ printf("\nThe circumference is %.2f.", 2.0f*Pi*radius); printf("\nThe area is %.2f.\n", Pi*radius*radius); return 0; }