assignmen 3-2 - binary1.cpp

this code is code c++. have many lesson

#include<iostream>

using namespace std;

int main()
{
    
    string input;
    int temp=128,ans = 0;
    cout << "Enter a number : " ;
    cin >> input;
    

if(input.at(0)-48 == 1){
    temp = 64; 
    ans = -128; 
     for(int i = 1; i < 8; i++,temp /= 2)
    {    
    if(input.at(i)-48 == 1)
    ans += temp;             
    }
     }
    
else{
    for(int i = 0; i < 8; i++,temp /= 2)
    {    
    if(input.at(i)-48 == 1)
    ans += temp;             
    }
}
    cout << "The decimal number : " << ans << endl;
    
    
    
system("PAUSE");
return 0;    
}