Detailed Explanation of Constants in C Language

Two Ways to Define Constants in C

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const float PI = 3.14;

#include <stdio.h>
int main(){   const float PI = 3.14;   printf("The value of PI is: %f", PI);   return 0;}

The value of PI is: 3.140000

#include <stdio.h>
int main(){   const float PI = 3.14;   PI = 4.5;   printf("The value of PI is: %f", PI);   return 0;}

Compile-time error: Cannot modify const object

The #define preprocessor is also used to define constants; the content about the #define preprocessor directive will be learned in later chapters.

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