how can i solve binary system in c++? [closed]

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how can i see the answer when i need to solve the decimal code to binary code?

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decimal code to binary code? i think that you mean decimal number to binary number, so use std::bitset e.g.

#include <bitset>
...
int i = 49;
std::cout << std::bitset<sizeof(i)*8>(i).to_string() << std::endl;