How can I use bitset in map?

user_14407275 0
Viewed 115

I am trying to store 0 to 25 numbers along with its 5 bit representation using bitset.
Here is the code :

int main()
{
   
   map<int, bitset<5> > myMap;
   myMap[0] = 00000;
   myMap[1] = 00001;
   myMap[2] = 00010;
   myMap[3] = 00011;

   // Like this I have stored 0 to 25 numbers.     
    
   auto pos = myMap.find(2);
   cout<< pos-> second <<endl;  // output is 01000
   
   pos = myMap.find(3);
   cout<< pos->second <<endl;   // output is 01001

   pos = myMap.find(15);
   cout<< pos->second <<endl;   // output is 01001

   pos = myMap.find(12);
   cout<< pos->second <<endl;   // output is 00000
   return 0;
}

It seems that my output is wrong.
Where I am wrong ?

bitset c++
2 Answers

In this line:

myMap[2] = 00010;

The int literal is converted to a bitset. The octal literal 00010 is decimal 8, which prints the output 01000. Similarly, the literal 00011 is decimal 9, which prints 01001.

You seem to want:

myMap[0] = 0;
myMap[1] = 1;
myMap[2] = 2;
myMap[3] = 3;
// etc.

// or simply
for(int i = 0; i < 25; ++i)
  myMap[i] = i;

Here's a demo.

user_83728530

0xxx is an octal number (base 8). You might want 0b0010 (C++14) or "00010".

user_26845390
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