C++ Programming Code Examples
C++ > For Loops and While Loops Code Examples
For finite loops we should have an expression which should give a false value some how.
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/* For finite loops we should have an expression which should give a false value some how.
In below code the expression will give false value if value of x will be greater than or equal to 10. Since we are incrementing value of x so after some time condition x < 10 will return false and while loop will terminate. */
int x = 0;
while (x < 10) // the condition is "x < 10"
{
++x; // statement executed in loop
}
cout << "Now x is " << x << endl;
In while loop, condition is evaluated first and if it returns true then the statements inside while loop execute, this happens repeatedly until the condition returns false. When condition returns false, the control comes out of loop and jumps to the next statement in the program after while loop. The important point to note when using while loop is that we need to use increment or decrement statement inside while loop so that the loop variable gets changed on each iteration, and at some point condition returns false. This way we can end the execution of while loop otherwise the loop would execute indefinitely. A while loop that never stops is said to be the infinite while loop, when we give the condition in such a way so that it never returns false, then the loops becomes infinite and repeats itself indefinitely.
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