For Loop , While Loop & Do-while Loop || Code with abuzar

 

 For Loop 

A  Loop is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of Times.

Syntax :

for ( init ; condition ; increment ) {

statements(s);

}

Explain  :

The init step is excited first , and only once . This step allows you to declare and initialize any loop any loop control variables . you are not required to put a statements here , as a long as a semicolon.

Next , the Condition is evaluated . if it is true , the body of the loop is executed . if it is false , the body of the loop does not execute and flow of control jump to the next statement.

After the body of the loop executed , the flow of control jumps back up the increment statements . This statements can be left blank , as long as a semicolon appears after the condition

The condition is now evaluated again . if it is true , the loop executes and the process repeat itself ( body of the loop , then increment step , and then again condition ). After the condition becomes false , the for loop terminates .

Example :

#include <iostream>

using namespace std;

int main() {

for (int i = 1; i <= 5; ++i){

 cout << i << " ";

 }

  return 0;

}

Output :

1 2 3 4 5

While- Loop 

In this loop , first the condition is evaluated first and if return true then the statements inside while loop executed , this happen repeatedly until the condition return false . When condition return false , the control comes out of the loop and jumps to the next statements in the program after while loop .

Note : The important point in while-loop we use the Increment and Decrement operator statements inside the loop so that the loop variables gets changed on each iteration , and at some points condition return false.

// C++ Program to print numbers from 1 to 5

#include <iostream>

using namespace std;

int main() {

 int i = 1; 

 // while loop from 1 to 5

 while (i <= 5){

  cout << i << " ";

  ++i;

 }

 return 0;

}

Output :

1 2 3 4 5

Infinite while Loop 

The loop which is never  stop is said that to be infinite while loop , when we give a condition which is never return false , then the loop become infinite and repeat itself.

#include <iostream>

using namespace std;

int main(){

int i=1; while(i<=6){

 cout<<"Value of variable i is: "<<i<<endl; i--;

}

}

Do-While- Loop 

Do-while is used to iterate a part of the program several times . if the number of iteration is not fixed and you and you must have to execute the loop at least once , it is recommended to use do-while loop.

The C++ do-while executed at least once because condition is checked after loop body 

#include <iostream>

using namespace std;

int main() {

 int i = 1; 

 //do...while loop from 1 to 5

 do {

 cout << i << " ";

  ++i;

  }

 while (i <= 5);

  return 0;

}

Output :

1 2 3 4 5

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