23define 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}

1// #define is a macro that lets you use an alias name to
2// make code more readable. During C++'s preproccessing stage, your macro
3// will be replaced with the suitable code needed for proper compiling. 
4
5#include <iostream>
6// used to define constants, types, functions and more....
7
8#define SIZE 5 
9#define MacroInt int 
10#define getmax(a,b) ((a)>(b)?(a):(b))
11
12int main(){
13  	MacroInt myIntAsMacro = 7;
14    std::cout<< getmax(SIZE, myIntAsMacro); // will return 7
15}
16