CS50 Cheat Sheet by Ruan

// include Standard Input and Output
#include <stdio.h>
// include CS 50 helper
#include <cs50.h>

int main(void)
{
    // Asks for the user name
    string name = get_string("What is your name? ");
    // Print the message
    printf("hello, %s.\n", name);
}

// Variables declaration
// The structure to declare variables is:
// type variable_name;

int my_integer;
char my_single_char;
bool true_or_false;
string a_long_string;
float price;

// you can also declare multiple vars of the same type in one line
string first, last, full;
int total, a, b;


// assign "=" values to a variable

my_integer = 10;
my_single_char = 'A';
true_or_false = true;
a_long_string = "A really long text";
price = 1.25;
// note: When working with strings the value needs to be under double quotes "
// When working with chars the value needs to be under single quotes '

// intialization
int my_age = 30;
float product_price = 123.45;
string message = "thank you";
char letter = 'A';

if (boolean-expression)
{
    // code if true
}

// ------

if (boolean-expression)
{
    // code if true
}
else
{
    //code if false
}

// ------
if (boolean-expression)
{
    // code if true
}
else if (another-boolean-expression)
{
    //code if first is false but second is true
}
else
{
    //code if all are false
}

//-- 
// Example ok ?: use
int x;
if (boolean-expression)
{
    x = 5;
}
else
{
    x = 10;
}
// this is a short form of the same code above
int x = boolean-expression ? 5 : 10;

//--------

int my_number = 10;
switch(my_number)
{
    case 1:
        printf("Number is 1");
        break;
    case 10:
        printf("Number is 10");
        break;
    default:
        printf("Number is invalid");
}

while (boolean-expression)
{
    // code will be executed while the boolean-expression is true
}


do
{
    // do-while will always execute at least once.
    // code will be executed while the boolean-expression is true
}
while (boolean-expression);


for (initilization ; boolean-expression ; increment)
{
    
}

for (int index = 0 ; index < 20 ; index ++)
{
    
}