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francois |
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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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} |
