数组的顺序存储表示和实现:
#include<stdarg.h>
#define MAX_ARRAY_DIM 8
typedef struct {
ElemType *base;
int dim;
int *bounds;
int *constants;
}Array;
Status InitArray(Array &A,int dim,...);
Status DestroyArray(Array &A);
Status Value(Array A,ElemType &e,...);
Status Assign(Array &A,ElemType e,...);
基本操作的算法描述:
Status InitArray(Array &A,int dim,...){
if(dim<1||dim>MAX_ARRAY_DIM) return ERROR;
A.dim=dim;
A.bounds=(int *)malloc(dim *sizeof(int));
if(!A.bounds) exit(OVERFLOW);
elemtotal=1;
va_start(ap,dim);
for(i=1;i<dim;++i){
A.bounds[i]=va_arg(ap,int);
if(A.bounds[i]<0) return UNDERFLOW;
elemtotal*=A.bounds[i];
}
va_end(ap);
A.base=(ElemType *)malloc(elemtotal*sizeof(ElemType));
if(!A.base) exit(OVERFLOW);
A.constants=(int *)malloc(dim*sizeof(int));
if(!A.constants) exit(OVERFLOW);
A.constants[dim-1]=1;
for(i=dim-2;i>=0;--i)
A.constants[i]=A.bounds[i+1]*A.constants[i+1];
return OK;
}
Status DestoyArray(Array &A){
if(!A.base) return ERROR;
free(A.base); A.base=NULL;
if !(A.bounds) return ERROR;
free(A.bounds); A.bounds=NULL;
if!(A.constatns) return ERROR;
free(A.constants); A.constants=NULL;
return OK;
}
Status Locate(Array A,va_list ap,int &off){
off=0;
for(i=0;i<A.dim;++i){
ind=va_arg(ap,int);
if(ind<0||ind>=A.bounds[i]) return OVERFLOW;
off+=A.constants[i]*ind;
}
return OK;
}
Status Value(Array A,ElemType &e,...){
va_start(ap,e);
if((result=Locate(A,ap,off))<=0 return result;
e=*(A.base+off);
return OK;
}
Status Assign(Array &A,ElemType e,...){
va_start(ap,e);
if((result=Locate(A,ap,off))<=0) return result;
*(A.base+off)=e;
return OK;
}