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 convertU(unsigned & 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 an unsigned and return true.

For example, convertU(n, "0101") and convertU(n, "10210") should return false;

convertU(n, "10011") should set n to 19 and return true.

Answer 1

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

#include<iostream>

#include<cmath>

#include<string>

using namespace std;

bool convertU(unsigned & n, const string & bits);

int main(){

    unsigned n;

    if(convertU(n, "0101"))

        cout<<"n = "<<n<<endl;

    if(convertU(n, "10210"))

        cout<<"n = "<<n<<endl;

    if(convertU(n, "10011"))

        cout<<"n = "<<n<<endl;

    return 0;

}

bool convertU(unsigned & n, const string & bits){

    n = 0;

    int len = bits.size();

    for(int i=0; i<bits.size(); i++){

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

            return false;

        if(bits[i]=='1')

            n += pow(2, len-i-1);

    }

    return true;

}