freeCodeCamp/index.md at 0a1eeea424e49c25c08a5b65ec66ac0ebec5e699

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Randell Dawson 0a1eeea424 fix(guide) Replace invalid prism code block names (#35961 )

* fix: replace sh with shell

fix replace terminal with shell

fix replace node with js

fix replace output with shell

fix replace cs with csharp

fix replace c++ with cpp

fix replace c# with csharp

fix replace javasctipt with js

fix replace syntax  with js

fix replace unix with shell

fix replace linux with shell

fix replace java 8 with java

fix replace swift4 with swift

fix replace react.js with jsx

fix replace javascriot with js

fix replace javacsript with js

fix replace c++ -  with cpp

fix: corrected various typos

fix: replace Algorithm with nothing

fix: replace xaml with xml

fix: replace solidity with nothing

fix: replace c++ with cpp

fix: replace txt with shell

fix: replace code with json and css

fix: replace console with shell

2019-05-15 19:08:19 +02:00

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title

title
While-loop

A while loop statement repeatedly executes a target statement as long as a given condition is true. It is often used when the number of iterations is unknown.

Syntax:

while(condition) {
   statement(s);
}

A key point of the while loop is that the loop might not ever run. When the condition is tested and the result is false, the loop body will be skipped and the first statement after the while loop will be executed.

Another important point about the while loop is to remember to increment/decrement/modify the variable used for checking the given condition at the beginning of each iteration, at the end of your loop, otherwise the loop will enter into an infinite loop.

Example:

#include <iostream>
using namespace std;

int main () {
   // Local variable declaration:
   int a = 10;

   // while loop execution
   while( a < 20 ) {
      cout << "value of a: " << a << endl;
      a++;
   }

   return 0;
}

Output:

value of a: 10
value of a: 11
value of a: 12
value of a: 13
value of a: 14
value of a: 15
value of a: 16
value of a: 17
value of a: 18
value of a: 19

Example of Skipped Loop Body:

#include<iostream>
using namespace std;

int main(){
   //Local variable declaration
   int age=10;
   
   //while loop execution
   while(age>21) {
   cout<<"The citizen is an adult."<<endl;
   }
   
   return 0;
}

Output:

Sources

www.tutorialspoint.com

1.4 KiB Raw Blame History

Sources

1.4 KiB

Raw Blame History