make line count

This is a discussion on make line count within the C Programming forums, part of the General Programming Boards category; If there is a file with words on each line; what method can I use to identify the last letter ...

  1. #1
    Ron
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    make line count

    If there is a file with words on each line; what method can I use to identify the last letter on each line.

    Please help. I have just this one issue to resolve in my program.

  2. #2
    Registered User 00Sven's Avatar
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    Get each line one at a time and then use something like strlen() to find the end and go from there.
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  3. #3
    Gawking at stupidity
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    The last letter on each line is always going to precede the the '\n' character. Unless the '\n' is the first character on the line in which case there is no last letter on the line
    If you understand what you're doing, you're not learning anything.

  4. #4
    Frequently Quite Prolix dwks's Avatar
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    The last letter on each line is always going to precede the the '\n' character
    Not always. A file doesn't have to have a blank line at the end (although it makes life easier if it does!).
    dwk

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  5. #5
    Ron
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    Thanks.
    So, are you the fact that the last letter on each line of an input line of words will be a '\0'?

    I was under the impression the last character in a string array only could be be a null character.

  6. #6
    Frequently Quite Prolix dwks's Avatar
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    No, see, when you read in a string with fgets(), it reads until the size of the buffer or EOF or a newline is reached. So oftentimes the buffer ends with '\n\0'.

    All strings in C end with a NULL character.
    dwk

    Seek and ye shall find. quaere et invenies.

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  7. #7
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    If you read multiple lines of a file at once eg. with fread(), there could be multiple newlines. Of course, with fread() no terminator is appended.
    Code:
    #include <stdio.h>
    
    void J(char*a){int f,i=0,c='1';for(;a[i]!='0';++i)if(i==81){
    puts(a);return;}for(;c<='9';++c){for(f=0;f<9;++f)if(a[i-i%27+i%9
    /3*3+f/3*9+f%3]==c||a[i%9+f*9]==c||a[i-i%9+f]==c)goto e;a[i]=c;J(a);a[i]
    ='0';e:;}}int main(int c,char**v){int t=0;if(c>1){for(;v[1][
    t];++t);if(t==81){J(v[1]);return 0;}}puts("sudoku [0-9]{81}");return 1;}

  8. #8
    Frequently Quite Prolix dwks's Avatar
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    Thanks.
    So, are you the fact that the last letter on each line of an input line of words will be a '\0'?

    I was under the impression the last character in a string array only could be be a null character.
    Sorry, I misread your question. NULL and '\0' and 0 are the same thing: FAQ > What's the difference between... > NULL, 0, \0 and nul?
    dwk

    Seek and ye shall find. quaere et invenies.

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    "Testing can only prove the presence of bugs, not their absence." -- Edsger Dijkstra
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