Average pay in euros and cent

This is a discussion on Average pay in euros and cent within the C Programming forums, part of the General Programming Boards category; Hey Folks, I did a sample exercise in which to calculate the average hourly pay rate. Asked the user to ...

  1. #1
    Registered User hamsteroid's Avatar
    Join Date
    Mar 2007
    Location
    Waterford, Ireland
    Posts
    62

    Average pay in euros and cent

    Hey Folks,
    I did a sample exercise in which to calculate the average hourly pay rate. Asked the user to enter the weekly pay (in euros as €12.51) and the weekly hours. These *had* to be read in as floating points. The output *had* to be in euro and cent separately.

    Could you guys comment on whether the technique below is elegant enough or is cumbersome? This was really a test of playing with conversions and casts.
    Just look at the *internal calculations* section and say whether it could be better done. I'm fairly happy with it - I'm not interesting trapping all cases at the moment - but want to see if this is the correct approach to get the cents and euros.
    Again I really appreciate your kind comments.
    Code:
    int main(void)
    {
      double weekly_pay = 0.0;
      double weekly_hours = 0.0;
      double average_pay_per_hour = 0.0;
      int euros = 0;        
      int cents = 0;
    
      /* prompt user for weekly pay in euro and weekly hours worked */
      printf("\nThis program will calculate your average hourly pay rate.");
      printf("\nPlease enter your weekly pay in euro: ");
      scanf("%lf", &weekly_pay);
    
      printf("Please enter your weekly hours worked: ");
      scanf("%lf", &weekly_hours);
    
      /* internal calculations */
      average_pay_per_hour = weekly_pay / weekly_hours;       
      euros = (int)average_pay_per_hour;                       /* keep the euro, knock the cent */
      cents = (int)(average_pay_per_hour * 100) - euros*100;   /* get cents */
    
      /* display results */
      printf("\nYour average hourly pay rate is %d euro and %d cents.\n",euros, cents);
      return 0;
    }
    
    /*
    Sample output:
    This program will calculate your average hourly pay rate.
    Please enter your weekly pay in euro: 105.1
    Please enter your weekly hours worked: 10
    
    Your average hourly pay rate is 10 euro and 50 cents

  2. #2
    Frequently Quite Prolix dwks's Avatar
    Join Date
    Apr 2005
    Location
    Canada
    Posts
    8,048
    Code:
      euros = (int)average_pay_per_hour;                       /* keep the euro, knock the cent */
      cents = (int)(average_pay_per_hour * 100) - euros*100;   /* get cents */
    The first line is good. But the second line is like saying
    Code:
    cents = (int)(average_pay_per_hour * 100) - ((int)average_pay_per_hour)*100;
    which is somewhat inefficient. I don't see what's wrong with just plain
    Code:
    cents = (int)(average_pay_per_hour * 100) % 100;
    Excellent code BTW. I couldn't have done better myself, assuming you accidently left out the closing comment symbol at the end of the file and the header files (well, just one: stdio.h). And you could read lines with fgets() and parse them from there and maybe check the return values of scanf() . . ..
    dwk

    Seek and ye shall find. quaere et invenies.

    "Simplicity does not precede complexity, but follows it." -- Alan Perlis
    "Testing can only prove the presence of bugs, not their absence." -- Edsger Dijkstra
    "The only real mistake is the one from which we learn nothing." -- John Powell


    Other boards: DaniWeb, TPS
    Unofficial Wiki FAQ: cpwiki.sf.net

    My website: http://dwks.theprogrammingsite.com/
    Projects: codeform, xuni, atlantis, nort, etc.

  3. #3
    Registered User hamsteroid's Avatar
    Join Date
    Mar 2007
    Location
    Waterford, Ireland
    Posts
    62
    Thanks dwks, I knew I a modulus was due to placed in there! / and % are always close together . Yeah, thanks for that. It's cleaner and % is seen in many previous examples. I haven't done this in years but it's nice to get back into it. My thoughts at this stage are - "Oh my! I'm actually putting more thought into the var types and the manipulation of them rather the staightforward process of division." In Oracle, I rarely ever think about vars anymore - just NUMBER and VARCHAR2(X). But C is fun, and I can't wait to get back to the maze.c program from years back.

    Code:
      /* internal calculations */
      average_pay_per_hour = weekly_pay / weekly_hours;
      euros = (int)average_pay_per_hour;                       /* keep the euro, knock the cent */
      cents = (int)(average_pay_per_hour * 100) % 100;         /* get cents */
      /* display results */
      printf("\nYour average hourly pay rate is %d euro and %d cents.\n",euros, cents);
    Last edited by hamsteroid; 03-31-2007 at 05:25 PM.

Popular pages Recent additions subscribe to a feed

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21