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Default Arguments In C++ Function

The default arguments are used when you provide no arguments or only few arguments while calling a function. The default arguments are used during compilation of program. 

Fig: Default Arguments In C++ Function

Program:

#include<iostream.h>

class BCA;

int sum(int a, int b=10, int c=20);

int main()

{

cout<<sum(1)<<endl;

 cout<<sum(1, 2)<<endl;

cout<<sum(1,2,3)<<endl;

return 0;

}

int sum(int a, int b, int c)

{

int z;

z=a+b+c;

return z;

}

Output:

31

23

6