how to define in c code example

Example 1: #define in c

#include <stdio.h>

#define NAME "TechOnTheNet.com"
#define AGE 10

int main()
{
   printf("%s is over %d years old.\n", NAME, AGE);
   return 0;
}

Example 2: define in c

#define CNAME value

Example 3: c define

#define SIZE 42
#define MSG "Hello, World!"

Example 4: declaration in c

#include<stdio.h>
#include<conio.h>
void main()
{
//variable declaration
	int a;
  //assinging value to a variable;
    a=10;
}