C #define

The #define preprocessor directive is used to define constant or micro substitution. It can use any basic data type.

Syntax:

snippet

#define token value

Let's see an example of #define to define a constant.

snippet

#include 
#define PI 3.14
main() {
   printf("%f",PI);
}

Output:

Output

3.140000

Let's see an example of #define to create a macro.

snippet

#include 
#define MIN(a,b) ((a)<(b)?(a):(b))
void main() {
   printf("Minimum between 10 and 20 is: %d\n", MIN(10,20));  
}

Output:

Output

Minimum between 10 and 20 is: 10

Related Tutorial

1 C Preprocessor Directives

2 C Macros

3 C #include

4 C #define

5 C #undef

6 C #ifdef

7 C #ifndef

8 C #if

9 C #else

10 C #error

11 C #pragma

Try it

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