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!

Tarefa

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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.

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Seção 4. Capítulo 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!

Tarefa

Swipe to show code editor

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.

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 4. Capítulo 1

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo