In C++, the keyword until is not a valid keyword. Instead, the keyword while is used to repeatedly execute a block of code until a certain condition becomes false.
The syntax for using while loop is as follows:
while (condition) {
// code block to be executed while the condition is true
}
Here's an example of how to use while loop to calculate the sum of numbers from 1 to 10:
int sum = 0;
int i = 1;
while (i <= 10) {
sum += i;
i++;
}
In this example, the while loop executes the code block as long as the condition i <= 10 is true. The variable i starts with a value of 1 and increments by 1 in each iteration of the loop. The variable sum is used to accumulate the sum of the numbers from 1 to 10.
The loop terminates when the condition i <= 10 becomes false, which occurs when i reaches a value of 11.
It's important to make sure that the condition used in the while loop eventually becomes false, or else the loop will continue executing indefinitely, resulting in an infinite loop.