Lecture 1: basic syntax
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This document provides an introduction to C++ programming for beginners. It covers installing C++, writing a "Hello World" program, using variables to store and manipulate data, if/else conditional statements, loops, and examples of programs to write that demonstrate various C++ concepts. The target audience is those with no prior coding experience who want to learn basic C++ skills quickly to help with job placement.
Lecture 1: basic syntax
- 1. Placement Preparation C++ Basics Shreyas Basarge
- 2. Target Audience People who have no prior coding experience, didn’t take CS101 seriously but want to learn some basics of coding quickly. If you know how write a program to print fibonacci numbers, do NOT waste your time by attending this tutorial.
- 3. Motivation 1. Most companies visiting IIT Guwahati require coding skills. 2. Everyone wants to get placed. 1 & 2 => You have to learn coding
- 4. Motivation
- 5. Hello World Your first fully functional program:
- 6. Running C++ code Linux: 1. Install g++ 2. g++ file_name.cpp 3. ./a.out Windows: 1. Open your favorite IDE 2. Write some code 3. Click the ‘play’ button n00b: 1. Go to ideone.com 2. Write some code. Select language (C++) 3. Click on Run
- 7. Variables Letters in which we can store numbers and other data like user input. Example: int x = 42; int y; y = x + 10; int z; cin >> z; // whatever user types in is stored in z cout << z; // whatever is in z is shown on the screen
- 8. Variables Example: Find square of a number
- 9. Variables Demo: 1. Take two integers from the user. 2. Find sum of their cubes. (If user’s numbers are 2 and 3, output should be 2x2x2 + 3x3x3 = 8 + 27 = 35)
- 10. Variables Variables can store integers, real numbers and some other things. int x; // x can store an integer x = 3; float y; // y can store a real number y = 3.14;
- 11. Variables Example: Find hypotenuse of a right angled triangle.
- 12. if-else When you want to do different things depending on some condition. Example: Write a program to find absolute value of given integer.
- 13. if-else
- 14. if-else if (x>3 || y<9) { … if (x>8 && y<4) { … if (x == 0) { … if (x*y >= 100) { … if (x != 7) { ...
- 15. if-else
- 16. loops Example: display all numbers from 1 to 20
- 17. loops Demo: Sum numbers from 1 to n.
- 18. loops The ‘for loop’
- 19. loops Demo: Sum of all even numbers from 1 to 100
- 20. Examples 1. Check if number is prime 2. Print the pattern: # ## ### #### 3. Find all triplets that sum to 10
- 21. Examples 4. Print fibonacci series 5. Find square root of x