define-preprocessor.c

#include <stdio.h>

#define MAX 10

int main()
{
    // int a = 10; // casual way
    // char name[a];
    char name[MAX];

    fputs("Enter your name(10 chars): ", stdout);
    fgets(name, MAX, stdin);

    printf("Your name is: %s \n", name);
    return 0;
}