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C++ references and pointers in function calls Cheat Sheet (DRAFT) by

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Regular variable

// variable definition


int count = 10;


// function definitions


void example( int i) {
    cout << i;
    i = 30;
}


int main() {
    example(count);
    cout << count;
    return 0;
}


// terminal output


10
10
 

Reference

// variable definition


int count = 10;


// functions definition


void example( int& i) {
    cout << i;
    i = 30;
}


int main() {
    example(count);
    cout << count;
    return 0;
}


// terminal output


10
30
 

Pointer

// variable definition


int count = 10;


// pointer definition


int* pCount = &count;


//functions definition


void example( int* i) {
    cout << *i;
    *i = 30;
}


int main() {
    example(pCount);
    cout << count;
    return 0;
}


// terminal output


10
30