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Message |
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Buda
Maille smith extrodanair
Gender: 
Joined: 30 Sep 2004 |
 Posted: Thu May 03, 2007 7:57 pm Post subject: C programing final |
Ok, so i got out of my Introduction to engineering computations (preaty much just a intro to the C language) final a coupla hours ago, and let me tell you it was easy, up till the last question.....
it was a freaking doozey
Maby not for experianced programers, but for an intro class it was very difficult.
the premis was this, you had to write a program that read a txt file with three columns of numbers, an ID a quantity, and a unit price. (as in a stores inventory)
a samle would be
101 200 3.0
131 34 30.0
104 20 15.0
102 30 16.0
and so on, (several IDs were repeated)
The program had to write a text file that first told the number of unique products, added the quantaties of the products, and then sorted them in ascending order, and then calculated the total cost of the entire inventory.
The program also had to be flexible enough to acomodate any number of lines and duplications.(he let us slide on the any number of lines part, and we were able to define a vaiable "N" that could be edited in the top of the program with the number of lines in the text file) though i relise now that i probaly could have just done a while(file!=EOF) loop, and had it do N++ at the end of the loop to count the number of lines and work with that.
The professer had to extend the exam for an hour so that most of the class(that hadnt given up) could finish
Being one of the few that finished with a (compleatly)working program, I feel proud of my self and wanted to share.
and in case your intrested, this is my program.
| Code: |
#include <stdio.h>
#include <stdlib.h>
/* number of lines of code */
#define N 7
/* this is so i dont have to edit lots of lines to switch between terminal output and text file output when debugging */
#define OUT outputfile
struct inventory
{
int id, quant;
float price;
};
struct inventory c[N];
int unIDs[N]={0};
/* This function checks for the number of unique ids */
int uniqueprod(void)
{
int i, j, k=0, un;
for(i=0; i<N; i++)
{
un=1;
for(j=0; j<N; j++)
{
if(c[i].id == unIDs[j])
{
un=0;
}
}
if(un==1)
{
unIDs[i]=c[i].id;
k++;
}
}
return k;
}
/*this function calculates price */
float calccost(float quant, float price)
{
float total;
total=quant*price;
return total;
}
int main(int argc, char *argv[])
{
int i, j, numID, tempID;
float totalinvcost=0.0;
FILE *inputfile;
FILE *outputfile;
outputfile=fopen("sortedinventory.txt", "w");
if ((inputfile=fopen("inventory.txt", "r"))==NULL)
{
printf("***data file could not be opened please try again***");
system("PAUSE");
return 0;
}
for(i=0; i<N; i++)
{
fscanf(inputfile, "%d %d %f\n", &c[i].id, &c[i].quant, &c[i].price);
}
numID=uniqueprod();
struct inventory unc[numID];
j=0;
/*put all unique IDs into an array */
for(i=0; i<N; i++)
{
if(unIDs[i] != 0)
{
unc[j].id=unIDs[i];
j++;
}
}
/*sort those IDs */
for(i=0; i<numID; i++)
{
for(j=i+1; j<numID; j++)
{
if(unc[i].id>unc[j].id)
{
tempID=unc[i].id;
unc[i].id=unc[j].id;
unc[j].id=tempID;
}
}
}
/* set all quantities for unique IDs to 0 */
for(i=0; i<numID; i++)
{
unc[i].quant=0;
}
/* if the IDs match, add the quantity of orginal to unique, and set unit price */
for(i=0; i<numID; i++)
{
for(j=0; j<N; j++)
{
if(unc[i].id==c[j].id)
{
unc[i].quant=unc[i].quant+c[j].quant;
unc[i].price=c[j].price;
}
}
}
/* calculate total inventory cost */
for(i=0; i<numID; i++)
{
totalinvcost=totalinvcost+calccost(unc[i].quant, unc[i].price);
}
/*prints to file */
fprintf(OUT, "There are %d kinds of product\n", numID);
fprintf(OUT, "\n");
fprintf(OUT, "Product ID Total Quantity Unit Price\n");
for(i=0; i<numID; i++)
{
fprintf(OUT, "%d %d %f\n", unc[i].id, unc[i].quant, unc[i].price);
}
fprintf(OUT, "Total inventory cost = %f\n", totalinvcost);
fclose(inputfile);
fclose(outputfile);
system("PAUSE");
return 0;
} |
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Shino
Fade into this fantasy, caught in the web of time
Age: 49
Gender:
Joined: 15 Sep 2002 |
| Posted: Fri May 04, 2007 8:48 am Post subject: |
Buda, first I edited your post and put your code into a [ code ] tag. It makes all the text fixed width and saves your formatting.
As for your program. Very well done! Considering this is a final, and you were being timed on it, I'm pretty impressed.
Maybe if I get time, I'll show you the Java version of this.  |
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Buda
Maille smith extrodanair
Gender:
Joined: 30 Sep 2004 |
| Posted: Fri May 04, 2007 9:48 am Post subject: |
| Shino wrote: | Buda, first I edited your post and put your code into a [ code ] tag. It makes all the text fixed width and saves your formatting.
|
thanks, I didnt think to do that.
| Shino wrote: |
As for your program. Very well done! Considering this is a final, and you were being timed on it, I'm pretty impressed.
Maybe if I get time, I'll show you the Java version of this. |
thanks for the compliment! I think I would be intrested in seeing this in java heh |
_________________
Avatar art by Scrum Yummy (and its awsome)
| Quote: | Recently I overheard two co-workers, the first of which was training the other one.
Co-Worker #1: "A boolean variable has two possible values: true or false."
Co-Worker #2: "Umm...true?" |
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Wins 56 - Losses 66
Level 13 |
EXP: 2709
HP: 3135
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STR: 755
END: 1190
ACC: 1090
AGI: 665
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Tharael, Brooding Evil (Sword)
(230 - 630) |
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Silver Adept
Otaku Lord
Age: 41
Gender:
Joined: 20 May 2003 |
| Posted: Fri May 04, 2007 1:34 pm Post subject: |
Looks good, Buda! Even though I don't know C, my experience in Ruby made that code look okay. I can show you how it would be done in Ruby on Rails. It would probably have a few less lines of code, but produce the same effect. I didn't learn how to output to file or input from file, though, so I'd have to pick up that part. |
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