advanced-c-cpp/const-expression.cpp at main · Dpbm/advanced-c-cpp · GitHub

32 lines (22 loc) · 513 Bytes

#include <iostream>

using namespace std;

constexpr int calc(int b){

return b < 10 ? b*10 : 5;

}

int main(){

const size_t size = 10;

int arr[size];

/*Error since b is not constant*/

/*int b = 10;*/

/*constexpr size_t a = b * 10;*/

const int b = 10;

constexpr size_t a = b * 10;

cout << "a: " << a << endl;

int result = calc(b);

cout << "result: " << result << endl;

int c = 10;

int result2 = calc(c);

/*C doesn't need to be constant*/

cout << "result2: " << result << endl;

return 0;

}

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