Help with time.

[caveman007X]

I need to know what I am doing wrong? I understand that theoretically it should not take you days to type in your name. But this is the simplest least amount of code I could use from mine with out changing a lot.

Please dont respond with anything to complex, I will not understand.

What I am trying to do is make a video store program, and right now I am trying to make a way to calculate last rental using time in the code.

#include <iostream>
#include <iomanip>
#include <string>
#include <fstream>
#include <ctime>
using namespace std;

int main ()
{
     string name;
     int which = 1;
     int lastRentTime[100];
     lastRentTime[which] = time(0);
     cout << "Please enter your name : ";
     cin >> name; 
     int difTime, daysEllapsed;
     difTime == (lastRentTime[1] - time(0));
     daysEllapsed == difTime % ( 86400 );
     cout << "That took you " << daysEllapsed << " days " << endl;
     system("pause");
     return 1;
}

[andywestken]

Why are you using == rather than = on lines 17 and 18?

[caveman007X]

Because it was the way my teacher taught me.

[Lynx876]

uhm...
Assignment( = )
Relational and equality( == )

You might want to read through this:
http://www.cplusplus.com/doc/tutorial/operators/

EDIT:
Here's a quote from that link:

Be careful! The operator = (one equal sign) is not the same as the operator == (two equal signs), the first one is an assignment operator (assigns the value at its right to the variable at its left) and the other one (==) is the equality operator that compares whether both expressions in the two sides of it are equal to each other.

[caveman007X]

Oh thanks. That would help a lot. But that still does not help my problem with time.

[andywestken]

But it should help. In your code, the uninitialized variable diftime is being compared to the difference between the last rental time and now.Whereas with =, it would be set to the difference.

Etc.

[Stewbond]

Is your problem that you are always getting 0 or a negative number?

You are taking lastRentTime[1] - time(0). Time will always be higher than or equal to lastRentTime (depending on how fast you entered your name).

Another thought can be found after looking up the time function:
http://www.cplusplus.com/reference/clibrary/ctime/time/

Try:

     time_t lastRentTime[100] = { time(NULL) };

     cout << "Please enter your name : ";
     cin >> name; 

     int diffTime = time(NULL) - lastRentTime[1];
     int daysEllapsed = diffTime % ( 86400 );

    cout << "That took you " << daysEllapsed << " days " << endl;