Bowling Program

Ok for my Programming II class there is an assigment that is supposed to pull a list of scores from a file and calculate them in output back to the user. There should be a prompt that asks for the file (an error message if there is no file). The program then uses the list of numbers and calculates the total score at the end.

To start off though I need help with the following code specifically in the "// Read N, how many numbers " part.

Code:

---

#include <stdio.h>

#include <stdlib.h>

 

int main()

{

// Declare file pointer

FILE *ifp;

int N, i, x;

char fname[50];

 

printf("Enter filename: ");

scanf("%s", fname);

printf("Opening %s\n", fname);

 

// Open file

ifp = fopen(fname, "r");

if (ifp == NULL)

{

  printf("Error, %s not available\n", fname);

  exit(1);

}

 

// Read N, how many numbers

fscanf( ifp, "%d", &N);

printf("How many is %d\n", N);


// Read the values from the file

 for (i = 0; i < N; ++i)

{

  fscanf(ifp, "%d", &x);

  printf("%d: %d\n", i, x);

}

return 0;

---

-----
In the output the program only prints 4 of the numbers in the file being opened in the program. Any advice?

How is the input file formatted? Give us an example.

2
3
6
5
7

I don't see any problems with your code.

You do realize that in the example you gave us, only first 3 lines would be read? First line to determine how many lines to read and then second and third because the first line was 2.

Haha yah, I looked it over and it was just a stupid mistake. Ok going further with this though...I'm trying to make a bowling score program. There are 21 frames total in a game of bowling. Right now I am just trying to add these 21 numbers together one after another...

Code:

---

// Read N, how many numbers

fscanf( ifp, "%d", &N);

printf("How many is %d\n", N);


// Read the values from the file

 for (i = 0; i < N; ++i)

{
  int total;
  fscanf(ifp, "%d", &x);
  total = total + x;
  printf("%d\n",  x);
  printf("%d\n", total);
}

---

Here's the file it's pulling from...

Code:

---

21

2
1

4
5

7
6

8
9

2
3

7
5

6
0

1
3

1
6

3
9
8

---

The output i'm trying to achieve is this set of numbers but after each number I want the sum of it and the numbers before it...like in bowling. I'm excluding spare and strike rules at the moment. The output starts adding at 1628480098...where did I go wrong?

Why do you believe total starts at zero?

You did not initialize total, therefore it starts out with whatever value happened to be at the memory location it was put at.

Think of defining a variable as drawing a box on a whiteboard that already has writing all over it. Chances are, you won't find a clean spot to draw a box of the desired size, so you draw over whatever is there already. When you initialize the variable - give it an initial value - you're erasing everything that got caught inside the box when you drew it and writing in the value you want.

Here's my complete code so far...

Code:

---

#include <stdio.h>
#include <stdlib.h>

int main()

{

// Declare file pointer

FILE *ifp;

int N, i, x;

char fname[50];

printf("Enter filename: ");

scanf("%s", fname);

printf("Opening %s\n", fname);

// Open file

ifp = fopen(fname, "r");

if (ifp == NULL)

{

  printf("Error, %s not available\n", fname);

  exit(1);
}

 
// Read N, how many numbers

fscanf( ifp, "%d", &N);

printf("How many is %d\n", N);
 
// Read the values from the file
 
 int total = 0;

 for (i = 0; i < N; ++i)
 
{
  fscanf(ifp, "%d", &x);
  printf("%d\n", x);
  total = total + x;
  printf("The total is: %d\n", total);
}

return 0;

}

---

Here is the file it is pulling from...It's supposed to represent a bowling score, each set of two numbers representing a frame (the set of three at the end representing the 10th frame).

Code:

---

21

2
1

4
5

7
6

8
9

2
3

7
5

6
0

1
3

1
6

3
9
8

---

Now, I have to incorporate STRIKE (10 plus two frames) rules and SPARE(10 plus 1 frame) rules. How would I do that? I've messed around with the for loop below but can't seam to get it to work.

Code:

---

int total = 0;

 for (i = 0; i < N; ++i)
 
{
  fscanf(ifp, "%d", &x);
  printf("%d\n", x);
  total = total + x;
  printf("The total is: %d\n", total);
}

---

This depends on how you are storing a spare or strike in your input file. Will you use the conventional 'X' and '/' ? That will break your current input gathering routine.

Will your input file be shorter if somebody bowls a perfect game? In a perfect game, only 12 balls are thrown, all strikes. Will your input file start with a 12 and have 12 X's or 10's?

Can you give us an example input file with spares and strikes and only valid bowling scores? You have several frames in your example with invalid score combinations (e.g. 7, 6; 8, 9; 7, 5; 3, 9, 8).

Spares and strikes will not be represented with X's and /'s. Here is an example Program of what i'm trying to do.

FILE

Code:

---

1 0 1 9 2 2 10 3 3 10 1 9 3 7 10 1 2

---

Output of program...

Code:

---

B O W L I N G  S T U F F           

=================================================

Frame  1:  1  total  1

Spare

Frame  2: 12  total  13

Frame  3:  4  total  17

Strike!

Frame  4: 16  total  33

Frame  5:  6  total  39

Strike!

Frame  6: 20  total  59

Spare

Frame  7: 13  total  72

Spare

Frame  8: 20  total  92

Strike!

Frame  9: 13  total 105

Frame 10:  3  total 108

=================================================

---

Okay, so you will have somewhere between 12 and 21 numbers in your file depending on how many strikes were thrown (excluding the first number telling you how many balls were thrown). I would define an array of 21 ints, and initialize them all to zero. Then, I would read in the scores ball by ball into the array.

Once you have all your input, you can do something like the following:

Code:

---

frame = 1
total = 0
for ball from 0 to num_balls_thrown - 1
    if the score for this ball is 10
        frame_score = add current and next two balls
        print "strike"
        increment i by 1
    else if the score for this ball and the next ball total 10
        frame_score = add current and next two balls
        print "spare"
        increment i by 2
    else
        frame_score = add current and next ball
        increment i by 2
    total += frame_score
    print frame, frame_score and total

---

Note that this might not work for the 10th frame since that's a bit special, but this should get you well on your way.

Quote:

---

Originally Posted by anduril462

Okay, so you will have somewhere between 12 and 21 numbers in your file depending on how many strikes were thrown (excluding the first number telling you how many balls were thrown). I would define an array of 21 ints, and initialize them all to zero. Then, I would read in the scores ball by ball into the array.

Once you have all your input, you can do something like the following:

Code:

---

frame = 1
total = 0
for ball from 0 to num_balls_thrown - 1
    if the score for this ball is 10
        frame_score = add current and next two balls
        print "strike"
        increment i by 1
    else if the score for this ball and the next ball total 10
        frame_score = add current and next two balls
        print "spare"
        increment i by 2
    else
        frame_score = add current and next ball
        increment i by 2
    total += frame_score
    print frame, frame_score and total

---

Note that this might not work for the 10th frame since that's a bit special, but this should get you well on your way.

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Thank you for this helpful information!!! I'm gonna keep on coding away. :D