Thread: When we should really use constant and define

code with define keyword

Code:

#include <stdio.h>

#define x  20


int main(void)
{
   printf("x = %d \n", x);
   
   return 0;
}

x = 20

code with constant keyword

Code:

#include <stdio.h>

int main(void)
{
	int x = 20;
	
   printf("x = %d \n", x);
   
   return 0;
}

x = 20

I don't see the difference between constant and define keyword in code

somebody can explain When we should really use constant and define keyword in code ?