For Loop
If you want to execute the code a certain number of times use the for
loop.
Syntax:
for (statement#1; statement#2; statement#3) {
// The code block
}
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 (statement#2) is false.
Let’s look at the example:
123for (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:
for (int x = 10; x >= 0; x-=2) {
cout << x << endl;
}
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For Loop
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If you want to execute the code a certain number of times use the for
loop.
Syntax:
for (statement#1; statement#2; statement#3) {
// The code block
}
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 (statement#2) is false.
Let’s look at the example:
123for (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:
for (int x = 10; x >= 0; x-=2) {
cout << x << endl;
}
¡Gracias por tus comentarios!