The while statement:

The first iteration facility that we will introduce is the while statement. This has the general form:

while (logical_expression)
{

statements;
}

The semantics of the while statement are as follows.

While the logical_expression is true, the statements are executed. The truth of the logical_expression is rechecked after each execution of the body of the while.

A very simple example of the use of the while statement is shown below:

int []vals = {10,20,30,40,50};
int i = 0, sum = 0;

while (i < 3)
{

sum = sum + vals [i];
i++;
}

This simple piece of code first creates an array and two integer variables. The body of the while adds the ith element of the array vals to the value stored in the variable sum; after this it increments the variable i used to index the array. The effect of the code is to add to sum the ?rst three elements of the array vals.

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