To substract two numbers without using minus sign c++ program

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{int a,b,c=0,i,f;
cout<<"Enter two numbers to substract :";
cin>>a>>b;
if(b>a)
{i=a;f=b;}
else
{i=b;f=a;}  //  i initial value  f final value
for( ;i<f;i++)
 ++c;
(b>a)?   //conditional operators eqivalent to if (b>a)
cout<<a <<"  -  "  <<b<< "  =  "<<(char)45<< c   //ASCII value of 45 is minus -
:   // else
cout<<a <<"  -  "  <<b <<"  =  "<< c;
getch();
}



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