?? 10tnr0.c
字號:
#include "stdio.h"
#include "10tnr.c"
main()
{ int i,j;
void tnrf(double ,double [],int,double []);
double t,h,y[3];
y[0]=1.0; y[1]=0.0; y[2]=-1.0;
t=0.0; h=0.001;
printf("\n");
printf("t=%6.3f\n",t);
for (i=0; i<=2; i++)
printf("y(%d)=%e ",i,y[i]);
printf("\n");
for (i=0; i<=9; i++)
{ tnr(t,h,3,y,tnrf);
t=t+h;
printf("t=%6.3f\n",t);
for (j=0; j<=2; j++)
printf("y(%d)=%e ",j,y[j]);
printf("\n");
}
printf("\n");
}
void tnrf(t,y,n,d)
int n;
double t,y[],d[];
{ t=t; n=n;
d[0]=-21.0*y[0]+19.0*y[1]-20.0*y[2];
d[1]=19.0*y[0]-21.0*y[1]+20.0*y[2];
d[2]=40.0*y[0]-40.0*y[1]-40.0*y[2];
return;
}
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