define in cpp

1#include <iostream> 
2  
3// macro definition 
4#define LIMIT 5 
5
6int main() 
7{ 
8    for (int i = 0; i < LIMIT; i++) { 
9        std::cout << i << "\n"; 
10    } 
11  
12    return 0; 
13} 

1#define SPEED ios::sync_with_stdio(false); cin.tie(0); cout.tie(0)
2#define ar array
3#define ll long long
4#define pb push_back

1// The #define preprocessor directive creates symbolic constants
2#include <iostream>
3using namespace std;
4
5#define CONSTANT 2.71828
6
7int main () {
8   cout << "Declared constant: " << CONSTANT << endl; 
9
10   return 0;
11}