need help please: Write a function which takes two string variables (not C strin

Question

need help please:

Write a function which takes two string variables (not C strings) as inputs and compares them. If they are equal, the function should return 0. If the first string is less than the second string, return a negative number. If the first string is greater than the second string, return a positive number. You are not allowed to use the compare method of the string data type. You must use the comparison operators. Do not write a main function. Your function does not do any cin or cout. Make sure to properly format all your code.

Explanation / Answer

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any questions ask

the main was just to test the code-you don't need it

#include<iostream>
#include <string>
using namespace std;
int compare(string,string);
int main()
{cout<<compare("aaa","bbb")<<endl;
cout<<compare("aaa","aaa")<<endl;
cout<<compare("bbb","aaa")<<endl;
system("pause");
}

int compare(string a, string b)
{int i;
for(i=0;a[i]!=''||b[i]!='';i++)
    if(toupper(a[i])<toupper(b[i]))
         return -1;
    else if (toupper(a[i])>toupper(b[i]))
         return 1;

if(a[i]==''&&b[i]=='')
      return 0;
if(a[i]=='')
      return -1;
else
      return 1;
}

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