深度学习
串的基本操作
前记:这一章课件里主要讲了串的属性和一些常用的操作。课件里面是通过伪代码的方式来进行描述,这样有利于同学们的理解,以及能够适用于各种编程语言。下面就针对C++语言对这些基本操作做一个具体的实现,大家在运用中可以参考。
mystring.h:
#ifndef MYSTRING_H #define MYSTRING_H #include <stdio.h> #include <stdlib.h> #include <windows.h> #define MAXSIZE 1000 #define SIZEINCREASE 10 #define TRUE 1 #define FALSE 0 #define OK 1 #define ERROR 0 #define INFEASIBLE -1 #define OVERFLOW -2 #define FORMAT "%3c" #define TURNLINE printf("\n\n") typedef long Status; typedef char ElemType; typedef struct { ElemType *ch; int length; //字符串的长度,不包含空字符 }String; void test(); void strPrint(String *); //打印字符串 Status strAssign(String *,char *); //复制字符串 Status strCopy(String *sourceString,String *destinationString); //复制字符串 int strCompare(String *s1,String *s2); //比较两个字符串 Status strClear(String *s); //清理字符串 Status strContact(String *s3,String *s1,String *s2); //连接两个字符串 Status subString(String *sub,String *s,int pos,int len); //返回某个字符串在第i个位置的子串 void test() { printf("step here..."); TURNLINE; } void strPrint(String *s) { int index; for(index=0;s->ch[index];++index) printf(FORMAT,s->ch[index]); TURNLINE; } Status strAssign(String *s,char *chars) { int i=0,index=0; char *c=NULL; c=chars; for(;*c!='\0';++i,++c); if(!i) { s->ch=NULL; s->length=0;} Else { s->ch=(ElemType *)malloc((i+1)*sizeof(ElemType)); if(!s->ch) exit(OVERFLOW); for(;index<=i;++index) { s->ch[index]=chars[index];} s->ch[i+1]='\0'; s->length=i;} return OK; } Status strCopy(String *sourceString,String *destinationString) { int index=0; if(sourceString->length ==0) { printf("源串为空串"); TURNLINE; } destinationString->ch=(ElemType *)malloc((sourceString->length+1)*sizeof(ElemType)); if(!destinationString) exit(OVERFLOW); destinationString->length =sourceString->length ; for(;index<=sourceString->length ;++index) destinationString->ch[index]=sourceString->ch[index]; destinationString->ch[sourceString->length +1]='\0'; return OK; } int strCompare(String *s1,String *s2) { int i=0; for(;i<=s1->length &&i<=s2->length ;++i) { if(s1->ch[i]!=s2->ch[i]) return s1->ch[i]-s2->ch[i]; } return s1->length -s2->length ; } Status strClear(String *s) { free(s->ch); s->ch=NULL; s->length =0; return OK; } Status strContact(String *s3,String *s1,String *s2) { int index=0,j=s1->length ; s3->ch=(ElemType *)malloc((s1->length+s2->length+1)*sizeof(ElemType));if(!s3->ch) exit(OVERFLOW); for(;s1->ch[index];++index) { s3->ch[index]=s1->ch[index]; } for(index=0;s2->ch[index] ;++index,++j) { s3->ch[j]=s2->ch[index]; } s3->ch[s1->length+s2->length+1]='\0'; s3->length =s1->length+s2->length; return OK; } Status subString(String *sub,String *s,int pos,int len) { int index,i; if(pos<1||pos>s->length||len<0) exit(OVERFLOW); sub->ch=(ElemType *)malloc((len+1)*sizeof(ElemType)); if(!sub) exit(OVERFLOW); for(index=pos-1,i=0;i<len;++index,++i) sub->ch[i]=s->ch[index]; sub->ch[i+1]='\0'; sub->length=i; return OK; } #endif 调用的main函数: #include "mystring.h" #include "fun.h" int main() { String str1,str2,str3;int index; char *chars="acabaabaabcacaabc\0"; char *chars1="abc\0"; strAssign(&str1,chars); strAssign(&str2,chars1); strPrint(&str1); strPrint(&str2); subString(&str3,&str1,5,100); strPrint(&str3); index=Index(&str2,&str1,9); printf("%d\n",index); return 0; }
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