C++ References Sheet Cheat Sheet

A Programming › C cheat sheet in English by vittochan

C++ References Sheet

C-

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PRs

Include Headers

#include <headername>
#include <iostream>	Several standard stream objects
#include <string>	std::basic_string class template
#include <math>	Behaves as if each name from <cmath> is placed in global namespace, except for names of mathematical special functions
#include <fstream>	std::basic_fstream, std::basic_ifstream, std::basic_ofstream class templates and several typedefs
#include <cctype>	Behaves as if each name from <cctype> is placed in global namespace

Namespace

using namespace std;

Data Types

int	integer type (-32768 to 32767)
char	single character type
float	Floating-point types (single precision)
double	Floating-point types (double precision)
bool	true or false
void	type with an empty set of values

Comments

//Single line
/*Multiple
lines*/

Pointers

int *ptr;	Pointer definition
ptr = &var1;	ptr set to address of var1
var2 = *ptr;	set var2 to value of var1

Arithmetic Operators

+, -, *, /	Addition, subtraction, multiplication, division
%	Modulus (rest of division)
++	Add 1 to variable (`example:` i++)
--	Subtract 1 to variable (`example:` i--)
+=, -=, *=, /=	Add/subtract/multiply/divide a value from the variable (`example:` i+=2; is equal to i=i+2;)

Relational Operators

<	Less than
<=	Less or Equal than
>	Greater than
>=	Greater or Equal than
==	Equal than
!=	Not Equal than

Logical Operators

\|\|	OR
&&	AND
!	NOT

If Else

if (condition) {
\\Do something
} else if (condition) {
\\Do something
} else {
\\Do something
}

condition must be a condition that return a boolean value true or false
else/else if blocks are optional

Switch

switch (variable) {
case constant1:
\\Do something
break;
case constant2:
\\Do something
break;
default:
\\Do something
break;
}

default is optional

While Loop

while (condition) {
\\Do something
}

Loop as long as the condition is true, when it becomes false it exits

Do-While Loop

do {
\\Do something
} while (condition);

Loop as long as the condition is true, when it becomes false it exits

For Loop

for (initialize; condition; update) {
\\Do something
}

example:
for (int i=0; i<10; i++) {
\\Do something
}

Loop as long as the condition is true, when it becomes false it exits

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