The for Loop in C++ :

for loop:

C language for Loop - The for loop is the easiest to understand of the C++ loops. All its loop control elements are gathered in one place, while in the other loop construction of C++, they are scattered about the program. The general syntax of the for loop is:

for(initialization expression;test expression;update expression)
body-of-the-loop;

Example :

  1. /* Description: Print 1 to 10 use for loop in C++ language */
  3. #include<iostream>
  4. using namespace std;
  6. int main()
  7. {
  8. int i;
  9. for(i=1;i<=10;i++)
  10. {
  11. cout << "\n"<<i <<"\n";
  12. }
  13. }

Output :

C++ language Print 1 to 10 use for loop

Note : If you change i<=10 to i=<20 inside the for loop, than this loop print 1 to 20.


Nested Loops :

A loop may contain another loop in his body This form of a loop is called nested loop. But in a nested loop, the inner loop must terminate before the outer loop.

  1. /* Description: simple nested loop program in C++ language */
  3. #include<iostream>
  4. using namespace std;
  6. int main()
  7. {
  8. int i,j;
  9. for(i=1;i<=20;i++)
  10. {
  11. cout << "\n";
  12. for(j=1;j<=i;j++)
  13. {
  14. cout <<"*";
  15. }
  16. }
  17. }

Output :

C++ language simple nested loop program

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