Write a program in C++ to print a pattern of right angle triangle with a number that will repeat a number in the row by using the friend function.
If we declare a function friend int show(T4Tutorials); as a friend in a class T4Tutorials then this function friend int show(T4Tutorials);can access the private and protected members of the class T4Tutorials. You must know that a global function can also be declared as a friend function of the class.
Syntax of friend function in C++
class class_name
{
…
friend return_type function_name(arguments);
…
}
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#include<iostream> using namespace std; class T4Tutorials { protected : int i,j,n,r; public : input() { cout<<"Enter no of rows : "; cin>>n; } friend int show(T4Tutorials); }; int show(T4Tutorials a) { for(a.i=1 ; a.i<=a.n ; a.i++) { for(a.j=1 ; a.j<=a.i ; a.j++) { cout<<a.i; } cout<<endl; } } int main() { T4Tutorials a; a.input(); show(a); } |
Output
