day+previous day

[fishalot79]

Hi,

In my program I would like to accumulate the total rice earnings. I cant seem to understand the logic. Can someone point me in the right direction?

#include <iostream>
#include <stdlib.h> 
#include <iomanip>
#include <cmath>
using namespace std;
int main()
{
     int day;
     double grains, accum;
     cout << "Day  Grains   Accum" << endl;
     for (day = 0; day <= 17; day++)
          {
          grains = pow(2.,day), accum = day+grains;  //accum needs to be grains given per day + grains given the previous day
          cout << (day + 1) << setw(9) << grains << setw(14) << accum <<  endl;        
          }

system("PAUSE");
}

[TheIdeasMan]

fishalot79

This bit:

grains = pow(2.,day), accum = day+grains;

should be 2 statements:

grains = pow(2.0,day);
accum = day+grains;  //not doing what you think - an unneeded  variable? 

If you named your variables Day, Total, DailyAmt - would that make it clearer?

Another clue - make use of the += operator.

Good Luck

[fishalot79]

grains = pow(2.0,day);
accum += grains;

Thank you very much!