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

C++ references and pointers in function calls - passing as argument

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