串的堆分配存储表示[原创]
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/*=================串的堆分配存储表示====================*/
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#include <stdio.h>
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#include <malloc.h>
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typedef struct{
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char *ch;
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int length;
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}hstring;
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/*==============================*/
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int print(hstring str){
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int i=str.length,j=0;
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if(!i){
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printf("\nthe string is empty..\n");
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return 0;
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}
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printf("The string:~");
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while(i--){
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printf("%c",str.ch[j]);
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j++;
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}
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}
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/*===========基本操作函数原型说明=============*/
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int strassign(hstring *t,char *chars){/* 生成一个其值等于串常量chars的串t*/
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int i,j=0;
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char *c;
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if(t->ch) free(t->ch);/* 释放t指向的原有空间*/
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for(i=0,c=chars ; c ; ++i,++c); /* 求chars的长度i*/
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if(!i){ t->ch=NULL; t->length=0;}/* 当chars所指串为空的情况*/
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else{
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if(!(t->ch=(char *)malloc(i*sizeof(char)))) return 0;
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while(--i){/*--i而不是i--*/
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t->ch[j]=chars[j];
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t->length=i;
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j++;
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}
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}
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return 1;
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}
41![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
42![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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int strcompare(hstring s,hstring t){/*比较两个串*/
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int i;
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for(i=0;i<s.length&&i<t.length;++i)
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if(s.ch[i]!=t.ch[i]) return s.ch[i]-t.ch[i];
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return s.length-t.length;
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}
49![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
50![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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int clearstring(hstring *s){/*将s清空*/
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if(s->ch){
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free(s->ch);
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s->ch=NULL;
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}
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s->length=0;
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return 1;
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}
59![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
60![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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int concat(hstring *t,hstring s1,hstring s2){/*用t返回由s1,s2联结成的新串*/
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int i,j=0;
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if(t->ch) free(t->ch);
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if(!(t->ch=(char *)malloc((s1.length+s2.length)*sizeof(char)))) return 0;
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i=s1.length;
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while(--i){/*先将s1复制到t中*/
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t->ch[j]=s1.ch[j];
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j++;
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}
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t->length=s1.length+s2.length;
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i=s2.length; j=0;
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while(--i){/*再将s2联结到t后面*/
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t->ch[j+s1.length]=s2.ch[j];
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j++;
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}
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return 1;
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}
81![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
82![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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void substring(hstring *sub,hstring s,int pos,int len){
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/*用sub返回串s的第pos个字符起长度为len的子串*/
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int i,j;
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if(pos<1 || pos>s.length || len<0 || len>s.length-pos+1){
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printf("\nplease input the correct pos or len..\n");
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return 0;
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}
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if(sub->ch) free(sub->ch);/*释放旧空间*/
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if(!len){/*返回空子串的情况*/
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sub->ch=NULL;
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sub->length=0;
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}
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else{/*完整子串*/
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sub->ch=(char*)malloc(len*sizeof(char));
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j=len; j=0;
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while(--i){
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sub->ch[j]=s.ch[pos-1+j];
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j++;
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}
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sub->length=len;
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}
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}
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/*================主函数部分======================*/
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main(){
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hstring *hs,*str,*st,*sub;
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str->ch="YANG ZHOU UNIVERCITY"; str->length=20;
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st->ch="JIAO JI 07"; st->length=10;
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hs->ch=""; hs->length=0;
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sub->ch=""; sub->length=0;
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print(*hs);
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strassign(hs,str->ch);
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printf("\nstrassign(hs,str),");
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print(*hs);
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printf("the string st,");/**/
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print(*st);
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if(strcompare(*str,*st)>0) printf("\nstr>st\n");/**/
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clearstring(str);/**/
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printf("clearstring(str),str,");
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print(*str);
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concat(hs,*str,*st);
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printf("\nconcat(hs,*str,*st),");
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print(*hs);
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substring(sub,*hs,5,10); /**/
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printf("\nsubstring(sub,*hs,5,10),print sub,");
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print(*sub);
139![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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substring(sub,*hs,10,15);/**/
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printf("\nsubstring(sub,*hs,10,15),print sub,");
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print(*sub);
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getch();
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}
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