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

C++ ios Library - Dec Function

It is used to sets the basefield format flag for the str stream to dec. When basefield is set to dec, integer values inserted into the stream are expressed in decimal base (i.e., radix 10). For input streams, extracted values are also expected to be expressed in decimal base when this flag is set.

Following is the declaration for std::dec function.

ios_base& dec (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::dec 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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