while Statement

while(expression)
statement

The while keyword executes statement repeatedly until expression becomes 0.

For more information, see do, for, break, and continue.

Example

This example copies characters from string2 to string1. If i is greater than or equal to 0, string2[i] is assigned to string1[i] and i is decremented. When i reaches or falls below 0, execution of the while statement terminates. 

// Example of the while statement
while ( i >= 0 )
{
    string1[i] = string2[i];
    i--;
}