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【C】字符串操作

作者:夲仒無道 / 发布于2013/7/1/ 642


	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>

	#define Maxsize 200

	typedef struct{
	char ch[];
	int length;
	}SeqString;

	
	void StrInsert(char *, char *, int);
	void StrDelete(char *, int, int);
	void StrMatch (SeqString , SeqString );
	int StrMatch (char *, char *);
	void StrReplace (char *, char *, char *);

	
	int main(){
	
	char s[] ="cmd";
	char t[] = "m";
	char x[] = "x";
	// StrDelete(s, 1, 1);

	StrReplace(s, t, x);
	printf("%s\n", s);
	}

	void StrInsert(char *S, char *T, int i){

	int len = strlen(S);
	if(len >= i ){
	 char *Temp;
	 Temp = (char *)malloc(sizeof(char[Maxsize]));
	// *Temp = '\0';
	
	 strcpy(Temp, &S[i]);
	 strcpy(&S[i], T);
	 strcat(S, Temp);
	 free(Temp);
	}
	}

	void StrDelete(char *S,int i, int m){
	char Temp[Maxsize] = "";
	if(i <= strlen(S)){
	 if(i+m <= strlen(S))
	 strcpy(Temp, &S[i+m]);
	 strcpy(&S[i], Temp);
	}
	}

	void StrMatch (SeqString T, SeqString P){
	int i,j,k;
	int m=P.length;
	int n=T.length;
	for (i=0; i<n-m; i++){
	 j=0;
	 k=i;
	 while(j<m&&T.ch[k]==P.ch[j]){
	 k++;
	 j++;
	 }
	 if(j==m) printf("\n%d",i);
	}
	printf("Search End.");
	}

	int StrMatch (char *T, char *P){
	int i,j,k;
	int m=strlen(P);
	int n=strlen(T);
	for (i=0; i<n-m; i++){
	 j=0;
	 k=i;
	 while(j<m&&*(T+k)==*(P+j)){
	 k++;
	 j++;
	 }
	 if(j==m)return (k - m);
	}
	}

	void StrReplace (char *T, char *P, char *S){
	int i , m;
	m=strlen (P);
	i=StrMatch(T,P);
	StrDelete(T,i,m);
	StrInsert(T,S,i);
	}

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