c - trouble reading an array from a file into an array then printing it to another file -


hey guys i'm trying make piece of code work in c, i've got data file looks this:

123 456 789 101 121 131 415....

it's data image, numbers in grid of 256x128, i'm trying read in numbers using nested loops , printing them in same way there should same grid in output file actually:

-858993460-858993460-858993460-858993460-858993460-858993460-858993460-858993460...

i'm not sure needs changed in code fix i'm new programming , 1 of first attempts @ code sorry if not clear

#include <stdio.h>;  #define height 128 #define width 256 #define max 255 char magic[] = "p3";  int main() {     {     int n, m;     double r[128][256];     file *red = null;     red = fopen ("picture.red", "r");           //read infile//         (n=0; n<128; n++)              {             (m=0; m < 256; m++)                 fscanf(red, "%d", &r[n][m]);    //scan in grid//         }         fclose (red);     }      {     int n,m;     double r[128][256];     file *pfile = null;     pfile = fopen ("myfile.ppm", "w");          //create new file//         fprintf(pfile, "%s\n%d %d\nnorman norm\n%d\n", magic, width, height, max);         (n=0; n<128; n++)             {                   //print header outpute file//             (m=0; m<256; m++)                 fprintf (pfile, "%d", r[n][m]); //print grid output file//             fprintf (pfile, "\n");         }         fclose(pfile);                          //close output file// return 0;     } }

thanks :)

at least 3 changes needed:

  • you need change first "%d" in fscanf "%lf" because &r[n][m] pointer double.

  • and change second "%d" in fprintf "%f".

  • and move double r[128][256]; both sections use same array (and delete second definition).

or, declare r int rather double.

edit: compiler using? widely-used compilers should have given warning. example, gcc gives, standard switches, warnings:

line 1: warning: tokens @ end of #include directive
line 18: warning: format '%d' expects type 'int *', argument 3 has type 'double *'
line 32: warning: format '%d' expects type 'int', argument 3 has type 'double'

(plus complaint prototype of main()).


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