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Java programmer having problems with C.

post #1 of 20
10/3/12 at 2:41pm
Thread Starter 
Hey guys,
I'm really used to programming in Java, but I'm currently taking a C class and my teacher isn't the best... I have a problem and I just can't figure it out. I'm not asking for direct code, just a bump in the right way...

I have to make a program that receives a text file, reads it and counts the specific amount of integers are in that line. Eventually I will have a count of how many 0's, 1's, 2's ... 9's are in the text file and I will just have to output that.

I plan on using three functions, main, a getLine function and a countNums function.

I'm using the getLine function out of The C Programming Language by Brian W. Kerninghan and Dennis M. Rtichie.

The getLine functions takes a char[] and a int as a parameter. is stores the line read in the char[] and the int is the limit of the char[].

I have no clue how to start the countNums function... Or even what to do in it.

Chears
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post #2 of 20
10/3/12 at 2:46pm
Make a pointer to a file and extract each char and test them against the numbers. An array to count the frequency of the digits.
Code:
File *fp;  /* for file pointer*/

fp=fopen(name,"r");

fp points to first character in the file. Then test it.
Edited by Makyl - 10/3/12 at 2:50pm
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post #3 of 20
10/3/12 at 2:52pm
Thread Starter 
We're not aloud to use FIle sadly, :/.

Which is what confused me, there is no code to actually support the import. Or none that he taught us atleast. we're just supposed to call the getLine function and it all goes in.

When I run the program I'm running it like....

./a.out < eahsfkjahskf.txt
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post #4 of 20
10/3/12 at 2:58pm
getline is usually used to read from stream like ./a.out 1245667788 to give the input. I don't remember about the files. Let me search and get back to you.

Try using fgets. I think that would work. but you would have to specify the maximum number of character in the file.
Edited by Makyl - 10/3/12 at 3:07pm
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post #5 of 20
10/3/12 at 3:10pm
Thread Starter 
Yep, the < akfkajshfkjas.txt substitutes the text from the keyboard after you run the program.

This is the code I have for my countNums function...
Code:
int countNums(char s[], int lim, int num)
{
   int c, i, count;
   int test = num;

   for (i = 0; i < lim -1 && (c = getchar()) != '\0\; i++)
          if (test == c)
               count++;

return count;
}

No luck, just returns a 0...
Edited by Saucee - 10/3/12 at 3:18pm
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post #6 of 20
10/3/12 at 3:19pm
I can't find anything. As far as I know you will have to use File to open a file to read from it. Maybe who knows some more will know how.

Sorry I could not be of more help.
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post #7 of 20
10/3/12 at 3:47pm
Thread Starter 
Quote:
Originally Posted by Makyl View Post

I can't find anything. As far as I know you will have to use File to open a file to read from it. Maybe who knows some more will know how.
Sorry I could not be of more help.

Hey, no problem. Thanks for the help anyway...

The problem isn't inputing the file, I have that down. The problem is creating the counNum method

Oops, that's the java in me :x.
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post #8 of 20
10/3/12 at 5:42pm
Thread Starter 
This is my main....
Code:

int main()
{
  char s[80];

  krgetLine(s, 80);
  printf(s);
  int test = countNums(s, 80, 1);
  printf("%f \n", test);
}

And this is my countNums function....
Code:

int countNums(char s[], int lim, int num)
{
  int i;
  int count = 0;
  for (i = 0; s[i] != '\0' || i < lim -1; i++)
    {
      if (num == s[i])
        count++;
    }
  return count;
}

And when I run it with a file containing a 1, I keep getting 0.... And I can't figure out why.
Edited by Saucee - 10/3/12 at 5:49pm
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post #9 of 20
10/3/12 at 11:11pm
Code:
int countNums(char s[], int lim, int num)
{
  int i;
  int count = 0;
  for (i = 0; s[i] != '\0' || i < lim -1; i++)
    {
      k=atoi(&s[i]);
      if (num == k)
        count++;
    }
  return count;
}

Try this and see if it works.
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post #10 of 20
10/4/12 at 12:26am
Can you post your entire code, that should help a massive amount! smile.gif
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