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C++ Runner

Run C++ line by line — arrays, vectors, functions, recursion, STL & cin — with a live call stack, variables, and output.

source — editable

execution — current line highlighted

1#include <iostream>

2using namespace std;

4int main() {

5 int a = 12, b = 5;

6 cout << "sum = " << a + b << endl;

7 cout << "diff = " << a - b << endl;

8 cout << "prod = " << a * b << endl;

9 cout << "quot = " << a / b << endl;

10 cout << "rem = " << a % b << endl;

11 return 0;

12}

program input (cin) — whitespace separated

call stack & variables

frame 0<globals>()

no locals yet

Program start

stdout (cout)

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Speed55

space · ◀ ▶ · r1 / 9

Teaching interpreter for a large subset of C++: variables, arithmetic/bitwise/logical/ternary operators, if/else, for/while/do-while, switch, break/continue, arrays (incl. 2D), std::vector, std::string methods, functions & recursion (with call stack), cin, and STL helpers (sort, reverse, min, max, swap, abs, sqrt, pow, gcd…). Not yet supported: classes/structs, maps/sets, pointers, and new/delete.