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 :

/* Description: Print 1 to 10 use for loop in C++ language */ #include<iostream> using namespace std; int main() { int i; for(i=1;i<=10;i++) { cout << "\n"<<i <<"\n"; } }

Output :

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.

/* Description: simple nested loop program in C++ language */ #include<iostream> using namespace std; int main() { int i,j; for(i=1;i<=20;i++) { cout << "\n"; for(j=1;j<=i;j++) { cout <<"*"; } } }

Output :