Question

I'm trying to convert between different number representations in C++ , I have the prototype but im not sure what do do from here

bool convert2(int & n, const string & bits);

bits should have size exactly 5, and each char of bits should be '0' or '1'; otherwise

return false.

If bits is ok, set n to the number that bits represents as a 2's complement number and

return true.

For example, convertU(n, "10011") should set n to -13 and return true.

Answer 1

If you have any doubts, please give me comment...

#include<iostream>

#include<cmath>

#include<string>

using namespace std;

bool convert2(int & n, const string & bits);

int main(){

    int n;

    cout<<"returns: "<<convert2(n, "10011")<<endl;

    cout<<"n = "<<n<<endl;

    return 0;

}

bool convert2(int & n, const string &bits){

    int n_bits = 5;

    int i=0;

    int result = 0;

    for(int i=1; i<n_bits; i++){

        if(bits[i]!='1' && bits[i]!='0')

            return false;

        if(bits[i]=='0')

            result += pow(2, n_bits-i-1);

    }

    result += 1;

    if(bits[0]=='1')

        result = -(result);

    n = result;

    return true;

}