Explain Loops – While loop, Do-while loop, for loop

- Loops are used to carry out certain instruction(s) in continuation for a fixed no of times.

- Syntax of while loop :

 

//initialization statement(s) while (condition) { //statement1; //statement2; …. …. }

- This prints numbers 0 to 9 on the screen.

- This is similar to while loop; the only difference is unlike while loop, in do-while loop condition is checked after the loop statements are executed. This means the statements in the do while loop are executed at least once; even if the condition fails for the first time itself.

 

//initialization stmt(s) do { Statement1; Statement2; } while (condition)

- Syntax of Do-while loop:

- It does exactly the same thing as while loop; only difference is the initialization, the condition statement is written on the same line.

- This is used when we want to execute certain statements for a fixed number of times.

- This is achieved by initializing a loop counter to a value and increasing or decreasing the value for certain no of times until a condition is satisfied.

- The loop statements are executed once for every iteration of the for loop.

for (initialize loop counter; condition checking; increasing/decreasing loop counter)

 

{ //statement1; //statement2; }

for (x = 0; x < 10; x++) { cout << x <<”\n”; }

- This code snippet will print numbers 0 to 9.