ug漸開線直齒輪C方程序如下：

/*?? HELLO.C -- Hello, world */

#include "stdio.h"
#include "math.h"
struct jkx_type
{
?? float x;
?? float y;
?? float zz;
} jkx[6];

/*x=r(cos(theta)+theta*sin(theta))

y=r(sin(theta)-theta*cos(theta))

??? x=r(cost+tsint),y=r(sint-tcost)?? */

main()
{?? FILE *fp;
??? int i;
?? float j=0,z,m,rb,u,a;
?? char * filename;
?? printf("%s\n","filename");
?? scanf("%s",filename);
??? if((fp=fopen(filename,"w"))==NULL)
??? {
????? printf("error!");
????? exit(0);
??? }
??? printf("%s\n","m=");
??? scanf("%f",&m);

??? printf("%s\n","z=");
??? scanf("%f",&z);

??? printf("%s\n","a=");
??? scanf("%f",&a);

??? a=(a/180)*3.1415926;
?? rb=0.5*m*z*cos(a);

??? for(i=0;i<6;i++)
??? {
???? u=(j/180)*3.1415926;

?? jkx[i].x=rb*(sin(u)-u*cos(u));
?? jkx[i].y=rb*(cos(u)+u*sin(u));
?? jkx[i].zz=0;
??? fprintf(fp,"%f??? %f??? %f?? ",jkx[i].x,jkx[i].y,jkx[i].zz);
??? fprintf(fp,"\n");
??? printf("%f??? %f??? %f??? \n",jkx[i].x,jkx[i].y,jkx[i].zz);
??? j=j+10;
??? }
fclose(fp);

???? getch();
}

/*??? a=0
b=360
m=0.7
r=m*z*cos(20)/2
s=(1-t)*a+t*b
t=1
xt=r*cos(s)+r*rad(s)*sin(s)
yt=r*sin(s)-r*rad(s)*cos(s)
z=15
zt=0??? */