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/* ecriture d'un reel sur n colonnes, optimiser la precision !!!!*/
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/* auteur : Alain RASSINEUX 04/1994 */
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include "m3d_const.h"
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#include "m3d_struct.h"
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#include "prototype.h"
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#define EPS_COLLAGE 1.e-10
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void m3d_prn(FILE *output,int n,float val)
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{
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int i, j, nb, iexpo ;
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double expo;
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char buf[8],ext[8], bufn[8], bufexpo[8] ;
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double val2 ;
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/* signe */
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m3d_itoa(n, bufn) ;
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ext[0] = 0 ;
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if ((float)fabs((double)val)<EPS_COLLAGE)
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{
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fprintf(output,"0.") ;
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for (i=0;i<n-2;i++) fprintf(output,"0") ;
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return ;
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}
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if (val<0.)
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{
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fprintf(output,"-") ;
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val = val * -1. ;
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m3d_prn(output,n-1,val) ;/* appel recursif */
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return ;
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}
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expo = log10((double)val) ;
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if (val>=1.)
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{
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i = expo ;
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/* valeurs superieures a 1 */
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/* on dispose de n cases 1 pour le point et
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i + 1 chiffres significatifs */
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j = n - 2 - i ;/* nombre de decimales */
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if (j>=0)
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{
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m3d_itoa(j, buf) ;
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strcat(ext,"%-") ;
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strcat(ext,bufn) ;
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strcat(ext,".") ;
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strcat(ext,buf);
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strcat(ext,"f") ;
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fprintf(output,ext,val) ;
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return ;
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}
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if (i == n - 1)
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{
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strcat(ext,"%-") ;
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strcat(ext,bufn) ;
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strcat(ext,".0f") ;
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fprintf(output,ext,val) ;
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return ;
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}
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/* notation exposant */
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/* determiner l'exposant */
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/* et le nombre maxi de chiffres significatifs */
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if ((i - (n - 3) + 1) <10 ) nb = n - 3 ;
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else nb = n - 4 ;
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val2 = val * pow((double)10.,(double)(nb-1-i)) ;
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/* prendre nb chiffres significatifs */
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val2 = ceil(val2) ;
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j = val2 ;
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strcat(ext,"E+") ;
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iexpo = i - nb + 1 ;
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m3d_itoa(iexpo, bufexpo) ;
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strcat(ext,bufexpo);
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fprintf(output,"%-d%s",j,ext) ;
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return ;
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}
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/* valeurs inferieures a 1 */
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else
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{
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if ((expo<-20.) || (val==0.)) /* valeur nulle */
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{
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val = 0. ;
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strcat(ext,"%-") ;
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strcat(ext,bufn) ;
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strcat(ext,".1f") ;
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fprintf(output,ext,val) ;
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return ;
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}
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i = expo ;
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if ((expo - i) != 0.) i-- ;
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if (i == -1)
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{
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fprintf(output,".") ;
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val2 = val * pow((double)10.,(double)(n-1)) ;
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val2 = ceil(val2) ;
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j = val2 ;
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fprintf(output,"%-d",j) ;
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}
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else if (i == -2)
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{
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fprintf(output,".0") ;
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val2 = val * pow((double)10.,(double)(n-1)) ;
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val2 = ceil(val2) ;
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j = val2 ;
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fprintf(output,"%-d",j) ;
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}
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else /* valeur inferieure */
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{
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if ((i - (n - 3) + 1) > -10)
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{
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nb = n - 3 ;
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iexpo = i - nb + 1 ;
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val2 = val * pow((double)10.,(double)(nb-1-i)) ;
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}
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else if ((i - (n - 3) + 1) == -10)
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{
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nb = n - 4 ;
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val2 = val * pow((double)10.,(double)(nb-1-i)) ;
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val2 = ceil(val2) ;
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j = val2 ;
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strcat(ext,"E-09") ;
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fprintf(output,"%-d%s",j,ext) ;
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return ;
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}
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else
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{
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nb = n - 4 ;
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iexpo = i - nb + 1 ;
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val2 = val * pow((double)10.,(double)(nb-1-i)) ;
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}
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val2 = ceil(val2) ;
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j = val2 ;
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strcat(ext,"E") ;
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m3d_itoa(iexpo, bufexpo) ;
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strcat(ext,bufexpo);
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fprintf(output,"%-d%s",j,ext) ;
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}
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}
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return ;
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}
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