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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_oct.htm below:

C++ ios Library - Oct Function

It is used to sets the basefield format flag for the str stream to oct. When basefield is set to oct, integer values inserted into the stream are expressed in octal base (i.e., radix 8). For input streams, extracted values are also expected to be expressed in octal base when this flag is set.

Following is the declaration for std::oct function.

ios_base& hex (ios_base& str);

str − Stream object whose format flag is affected.

It returns Argument str.

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

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

In below example explains about std::oct function.

#include <iostream>

int main () {
   int n = 70;
   std::cout << std::dec << n << '\n';
   std::cout << std::hex << n << '\n';
   std::cout << std::oct << n << '\n';
   return 0;
}

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

70
46
106

ios.htm

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