Contenu du cours

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

For Loop

If you want to execute the code a certain number of times use the for loop.

Syntax:

It looks a bit difficult but let’s understand what is actually going on:

The statement#1 is an initial statement. It is executed at the beginning of for loop and doesn’t repeat later.
The statement#2 is the condition. The code block in the loop is executed if the condition is true (for example x < 4).
The statement#3 is executed every time after the code block execution (in most cases it’s this statement increment/decremant the control variable of the loop).

The loop body stops execution if the condition is false.

Let’s look at the example:


              123
            
for (int x = 1; x < 5; x++) {
    cout << x << endl;
}

This code prints numbers from 1 to 4. Firstly the code sets in the variable x the value 1 before the loop starts. Then we mention that the program should execute the block while the x is less than 5 (x<5) and increment it by 1 every time after the code block execution.

You can also change statements in any convenient way. For example, we want to print all even numbers descending from 10 to 0:


              123
            
for (int x = 10; x >= 0; x-=2) {
    cout << x << endl;
}

Tâche

Swipe to start coding

The office employee makes 13 calls per hour, he works 8 hours a day. Write a program that will output the number of calls the worker has made by each hour.

Declare the variable calls type of int.
Use for loop to calculate the hours.
Calculate the number of calls by multiplying the variables i and 13.
Print the variable calls in the for loop.

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

Solution

Passez à un bureau pour une pratique réelleContinuez d'où vous êtes en utilisant l'une des options ci-dessous

Tout était clair ?

Merci pour vos commentaires !

Section 4. Chapitre 3

For Loop

If you want to execute the code a certain number of times use the for loop.

Syntax:

It looks a bit difficult but let’s understand what is actually going on:

The statement#1 is an initial statement. It is executed at the beginning of for loop and doesn’t repeat later.
The statement#2 is the condition. The code block in the loop is executed if the condition is true (for example x < 4).
The statement#3 is executed every time after the code block execution (in most cases it’s this statement increment/decremant the control variable of the loop).

The loop body stops execution if the condition is false.

Let’s look at the example:


              123
            
for (int x = 1; x < 5; x++) {
    cout << x << endl;
}

You can also change statements in any convenient way. For example, we want to print all even numbers descending from 10 to 0:


              123
            
for (int x = 10; x >= 0; x-=2) {
    cout << x << endl;
}

Tâche

Swipe to start coding

The office employee makes 13 calls per hour, he works 8 hours a day. Write a program that will output the number of calls the worker has made by each hour.

Declare the variable calls type of int.
Use for loop to calculate the hours.
Calculate the number of calls by multiplying the variables i and 13.
Print the variable calls in the for loop.

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

Solution

Passez à un bureau pour une pratique réelleContinuez d'où vous êtes en utilisant l'une des options ci-dessous

Tout était clair ?

Merci pour vos commentaires !

Section 4. Chapitre 3

Passez à un bureau pour une pratique réelleContinuez d'où vous êtes en utilisant l'une des options ci-dessous