Thread: C programming

  1. 04-27-2003 #1
    jacktibet
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    Question C programming

    text file(file.in)
    111111...111111
    000001...110000
    111111...111110
    101000...001010
    ...........................
    ...........................
    101110...100001

    the high is 16 characters
    the width is 16 characters
    i need input a two-dimension array to **data


    char **data;
    int hsize; //hsize =16
    int wsize; //wsize=16
    int yy;
    int i;
    FILE *infile;

    can i look as **data as data[][]?
    can i use

    infile=fopen("file.in","r";
    yy=sizeof(char*)*hsize;
    data=(char**)malloc(yy);
    for(i=0;i<wsize;i++)
    fscanf(infile,&data[i]);
  2. 04-27-2003 #2
    XSquared
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    Code:
    infile = fopen( "file.in" , "r" );
data = malloc( hsize );
for( i = 0; i < hsize; i++ ) {
    data[i] = malloc( wsize );
    fscanf(infile, "%s", data[i] );
}
...
for( i = 0; i < hsize; i++ )
    free( data[i] );
free( data );
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  3. 04-27-2003 #3
    jacktibet
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    Thank you a lot.
    can u tell me why to use free()?
  4. 04-28-2003 #4
    quzah
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    Anything you (c|m)alloc, you must free when you're done with it.

    Quzah.
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