C++ ios Library - Function Right


It is used to sets the adjustfield format flag for the str stream to right. When adjustfield is set to right, the output is padded to the field width (width) by inserting fill characters (fill) at the beginning, effectively adjusting the field to the right.


Following is the declaration for std::right function.

ios_base& right (ios_base& str);


str − Stream object whose format flag is affected.

Return Value

It returns Argument str.


Basic guarantee − if an exception is thrown, str is in a valid state.

Data races

It modifies str. Concurrent access to the same stream object may cause data races.


In below example explains about std::right function.

#include <iostream>

int main () {
   int n = -77;
   std::cout.width(6); std::cout << std::internal << n << '\n';
   std::cout.width(6); std::cout << std::left << n << '\n';
   std::cout.width(6); std::cout << std::right << n << '\n';
   return 0;

Let us compile and run the above program, this will produce the following result −

-   77