Course Content

Introduction to C++

1. Basics

2. Variables

Types of Variables Identifiers User Input Strings Simple Math Not Simple Math Increment (Prefix and Postfix)Constant Challenge

3. Conditional Statements

Booleans If Expression More Logical Operators Else Expression Else If Expression Short Forms Challenge Switch Statement The Keyword Default

4. Loops

While Loop Do/While Loop For Loop Break/Continue Statements

5. Intro to Arrays

Basic Concept of the Array Loops in Arrays Manipulations with Arrays Challenge

While Loop

What is a loop in C++? It’s a cycle which repeats until the certain condition is true.

For example, one of the most popular loops is while:

As long as the specified condition is true we repeat doing the code in the while cycle. When the condition becomes false, the program starts to execute the line that follows this loop. An example of the while loop:


              12345
            
int i = 0;
while (i < 3) {
    i ++;
    cout << i << endl;
}

Initially, we declare the variable i as 0. Then the while loop checks the condition (i < 3) by each iteration and if the statement is true, we increment the variable i and print it. By the third iteration, i becomes 3 and the program doesn’t execute the code in the while loop again since the condition is false.

You can also use the while loop to interact with the user’s input or do something certain number of times. For example, calculate the sum of 3 user’s inputs:

By each iteration we add the user’s input number to the variable sumInputs - our sum and increment i since to execute the code in the block 3 times.

Be careful writing the loops! Increase/decrease the value in the condition or your loop will never end!

Task

Calculate the sum from 3 to 15 using the while loop:

Create a variable i type of int with value 3.
Using while loop, add all the numbers less or equal to 15 and bigger or equal to 3. Assign the sum to the variable sum. Do not forget to increase your number on each step (i ++).
Print the variable sum.

Please, don’t forget to type the semicolumn at the end of the lines.

Task

Calculate the sum from 3 to 15 using the while loop:

Create a variable i type of int with value 3.
Using while loop, add all the numbers less or equal to 15 and bigger or equal to 3. Assign the sum to the variable sum. Do not forget to increase your number on each step (i ++).
Print the variable sum.

Please, don’t forget to type the semicolumn at the end of the lines.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 4. Chapter 1

While Loop

What is a loop in C++? It’s a cycle which repeats until the certain condition is true.

For example, one of the most popular loops is while:


              12345
            
int i = 0;
while (i < 3) {
    i ++;
    cout << i << endl;
}

You can also use the while loop to interact with the user’s input or do something certain number of times. For example, calculate the sum of 3 user’s inputs:

By each iteration we add the user’s input number to the variable sumInputs - our sum and increment i since to execute the code in the block 3 times.

Be careful writing the loops! Increase/decrease the value in the condition or your loop will never end!

Task

Calculate the sum from 3 to 15 using the while loop:

Create a variable i type of int with value 3.
Using while loop, add all the numbers less or equal to 15 and bigger or equal to 3. Assign the sum to the variable sum. Do not forget to increase your number on each step (i ++).
Print the variable sum.

Please, don’t forget to type the semicolumn at the end of the lines.

Task

Calculate the sum from 3 to 15 using the while loop:

Create a variable i type of int with value 3.
Using while loop, add all the numbers less or equal to 15 and bigger or equal to 3. Assign the sum to the variable sum. Do not forget to increase your number on each step (i ++).
Print the variable sum.

Please, don’t forget to type the semicolumn at the end of the lines.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 4. Chapter 1

While Loop

What is a loop in C++? It’s a cycle which repeats until the certain condition is true.

For example, one of the most popular loops is while:


              12345
            
int i = 0;
while (i < 3) {
    i ++;
    cout << i << endl;
}

You can also use the while loop to interact with the user’s input or do something certain number of times. For example, calculate the sum of 3 user’s inputs:

By each iteration we add the user’s input number to the variable sumInputs - our sum and increment i since to execute the code in the block 3 times.

Be careful writing the loops! Increase/decrease the value in the condition or your loop will never end!

Task

Calculate the sum from 3 to 15 using the while loop:

Create a variable i type of int with value 3.
Using while loop, add all the numbers less or equal to 15 and bigger or equal to 3. Assign the sum to the variable sum. Do not forget to increase your number on each step (i ++).
Print the variable sum.

Please, don’t forget to type the semicolumn at the end of the lines.

Task

Calculate the sum from 3 to 15 using the while loop:

Create a variable i type of int with value 3.
Using while loop, add all the numbers less or equal to 15 and bigger or equal to 3. Assign the sum to the variable sum. Do not forget to increase your number on each step (i ++).
Print the variable sum.

Please, don’t forget to type the semicolumn at the end of the lines.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

What is a loop in C++? It’s a cycle which repeats until the certain condition is true.

For example, one of the most popular loops is while:


              12345
            
int i = 0;
while (i < 3) {
    i ++;
    cout << i << endl;
}

You can also use the while loop to interact with the user’s input or do something certain number of times. For example, calculate the sum of 3 user’s inputs:

By each iteration we add the user’s input number to the variable sumInputs - our sum and increment i since to execute the code in the block 3 times.

Be careful writing the loops! Increase/decrease the value in the condition or your loop will never end!

Task

Calculate the sum from 3 to 15 using the while loop:

Create a variable i type of int with value 3.
Using while loop, add all the numbers less or equal to 15 and bigger or equal to 3. Assign the sum to the variable sum. Do not forget to increase your number on each step (i ++).
Print the variable sum.

Please, don’t forget to type the semicolumn at the end of the lines.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 4. Chapter 1

Switch to desktop for real-world practiceContinue from where you are using one of the options below