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Introduction [cont'd]
Input Output Functions [cont'd]
Structures and Unions [cont'd]
# Preprocessor [cont'd]
#define in # Preprocessor of Programming in C
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#define 
#define is a preprocessor directive, to define a constant.
Syntax 
#define identifier identifier_value;
Program
	#include
	#define PI 3.14
	void main(){
	   float r;
	   float area;
	   printf("Enter the radius:");
	   scanf("%f",&r);
	   printf("Area of circle\n");
	   area = PI * r * r;
	   printf("%f",area);
	}
Output 
Enter the radius: 12

Area of circle
452.160004
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