comment ecrire des unsigned short dans un fichier???
J'ai une fonction compute_log qui me calcule 2 tables, gflog et gfilog (pour la petite histoire, c'est le logarithme et l'antilogarithme dans le champs de Galois), mais pour optimiser mon code je veux écrire directement les résultats dans un fichier .h
mais j'ai des probleme de types....
comment je dois faire pour les résoudre, et existe t il une méthode plus simple???
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| #include <malloc.h>
#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<string.h>
int compute_log(int);
unsigned int prim_poly_4 = 023;
unsigned int prim_poly_8 = 0435;
unsigned int prim_poly_16 = 0210013;
unsigned short *gflog, *gfilog;
int main ()
{
//if you use the function get_sentence
int NW;
int k;
int i;
// int temp[3]={8, 16, 256};
FILE *pt;
char *nom = "gflog8.h";
char *test;
pt = fopen(nom,"wt");
fputs ("int *gflog8={",pt);
NW = 8;
i = compute_log(NW);
if (i == -1) printf("NW should be 4, 8 or 16\n");
for(i=0;i<NW;i++)
{
test = (char *) gflog++;
fputs(test,pt);
fputs (", ",pt);
test++;
}
fputs ("}",pt);
return 1;
}
////////////////////////////////////////////////////////////::
int compute_log(int NW)
{
unsigned int b, log, x_to_w, prim_poly;
int w;
w = (int) (log10 ( (double) NW) / log10(2));
switch(w) {
case 4: prim_poly = prim_poly_4; break;
case 8: prim_poly = prim_poly_8; break;
case 16: prim_poly = prim_poly_16; break;
default: return -1;
}
x_to_w = 1 << w;
gflog = (unsigned short *) malloc (sizeof(unsigned short) * x_to_w);
if(gflog == NULL)
{
fprintf(stderr,"Allocation gflog impossible \n");
exit(EXIT_FAILURE);
}
gfilog = (unsigned short *) malloc (sizeof(unsigned short) * x_to_w);
if(gfilog == NULL)
{
fprintf(stderr,"Allocation gfilog impossible \n");
exit(EXIT_FAILURE);
}
b = 1;
for (log = 0; log < x_to_w-1; log++)
{
gflog[b] = (unsigned short) log;
gfilog[log] = (unsigned short) b;
b = b << 1;
if (b & x_to_w) b = b ^ prim_poly;
}
return 0;
} |
:roll:
Re: comment ecrire des unsigned short dans un fichier???
Citation:
Envoyé par gronaze
:roll:
Ne compile pas
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|
Compiling: main.c
main.c: In function `main_':
main.c:24: warning: initialization discards qualifiers from pointer target type
main.c:20: warning: unused variable `k'
main.c: In function `compute_log':
main.c:50: warning: declaration of 'log' shadows a global declaration
C:/Program Files/CodeBlocks/include/math.h:148: warning: shadowed declaration is here
main.c:53: warning: passing arg 1 of `log10' as floating rather than integer due to prototype
main.c:56: error: `prim_poly_4' undeclared (first use in this function)
main.c:56: error: (Each undeclared identifier is reported only once
main.c:56: error: for each function it appears in.)
main.c:57: error: `prim_poly_8' undeclared (first use in this function)
main.c:58: error: `prim_poly_16' undeclared (first use in this function)
main.c:87:2: warning: no newline at end of file
Process terminated with status 1 (0 minutes, 0 seconds)
5 errors, 6 warnings |
