While loop Cplusplus

By: Prof. Dr. Fazal Rehman | Last updated: March 3, 2022

What is while loop?

While loop have the following properties;
  • Conditional loop structure
  • Executes the statements until the given condition remains true. Stop the loop when given condition false.

When to use while loop?

  • When programmer does not know in advance the total number of repetitions of loop.
What is the syntax of while loop?
Syntax
While (condition) { statements; Loop increment; }
Example:
1 2 3 4 5 6 7 8 9 10 11 12 13   #include<iostream> using namespace std; int main() { int number=1; while(number<=10) { cout<<“number is “<<number<<endl; number++; } cout<<“you are outside the loop”; }               
 
Output:
number is 1 number is 2 number is 3 number is 4 number is 5 number is 6 number is 7 number is 8 number is 9 number is 10 you are outside the loop
Line 5:
  • Integer type loop variable “number” is declared and initialized with value 1.
Line 6:
  • There is a condition that loop will execute if value of number variable is less than or equal to 10.
Line 7:
  • Start of loop
Line 9:
  • Value of loop variable number is incremented.
 
Test Your Understandings
1. If the given condition is false then no statement execute in while section? True / False
Answer - Click Here:
True
while(number<=10); { cout<<“number is “<<number<<endl; number++; } 2. What is the error in code above?
Answer - Click Here:
Error: while(number<=10); Correct: while(number<=10)
 

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