While Loop in C Programming

While Loop in C

• A while loop is used to repeatedly execute code as long as a condition is true.
• The condition can be a direct integer value, a variable, or an expression.
• Any non- zero value is considered true.
• If the condition contains a variable, the variable must be initialized before the loop starts.
• When the condition is true, the statements inside the loop are executed, including the update expression.
• When the condition is false, the loop terminates, and program control jumps to the next statement after the while loop.
• The condition is evaluated again after each iteration of the loop.

Example

• The example demonstrates a while loop that calculates the sum of all integers from 1 to a user-defined value.
• The user is prompted to "Enter integer number."
• The program uses a counter variable initialized to 1 and a sum variable initialized to 0.
• The loop continues as long as the counter is less than or equal to the user's input number.
• Inside the loop, the sum variable is updated by adding the current value of the counter.
• After each iteration, the counter variable is incremented by 1.
• The loop terminates when the counter becomes greater than the user's input number.
• The final value of the sum variable represents the sum of all integers from 1 to the input number.