Download C# Cheat Sheet and more Lecture notes Applied Computing in PDF only on Docsity! C# Cheat Sheet Primitive data types These are basic types defined by the programming language to store simple values like integers, double, float, char, boolean. Variables Variables are containers that stores values. They have a type, a name, and a value. int number1 = 5; double number2 = 3.14; // Compare two variables (primitive data types only) number1 == number2 Strings A string is a sequence of characters, specified between quotes. String name1 = "John"; String name2 = "Jane"; Strings cannot be compared like primitive data types. Console.WriteLine(name1.Equals(name2)); Print to the console It is useful to print values to the console. To show the result of an operation on the screen, to find out if our algorithm is giving the right results. Console.WriteLine( "John" ); Keyboard (Console) input Console.WriteLine("Enter a number: "); int a = Convert.ToInt32(Console.ReadLine()); Console.WriteLine(a); Console.WriteLine("Enter a name: "); String name = Console.ReadLine(); Console.WriteLine(name); Arrays An array is a collection of values of the same type. We access the elements using an index. The first element is in the position 0. int[] array1 = {1,2,3,4,5,6,7}; Console.WriteLine(array1[0]); int b = array1[1] + array1[2]; Console.WriteLine(b); //Create an array to store 5 elements int[] array2 = new int[5]; // Asign a value to the first position array2[0] = 15; Console.WriteLine(array2[0]); if-else If-else structure is used to do something according to a condition. if (number1>10){ // Do something } else{ //Do something else } Loops Loops can have pre-condition or post-condition. //With pre-condition for (int i = 10; i < 5; i++) { //Do something } int index = 0; while (index<5){ //Do something } //With post-condition do { //Do something }while(index<5); Classes A class is a type. It allows you to represent the behaviours of certain objects. It has a name, attributes and methods. class Person{ private String name; public Person(String name) { this.name = name; } public String getName() { return name; } }
