行编辑器.cpp

1.建立一个以字符串文件,即从键盘输入若干行字符串,把它们输出到磁盘文件保存起来. 2.从磁盘文件上读回字符串,并在屏幕上显示出来. 3.从磁盘文件中查找字符串,判断文件中是否存在所查找的字符串,

#include"string.h"
#include"stdlib.h"
#include"stdio.h"

void write(void);
void read(void);
void search(void);	
int replace(char str[],char st[],int n);
void add(void);

int main()
{	
	int n=10;
	char str[10],st[10];
	while(1)
	{
		printf("\nStart your program:\n");
		printf("input 'w' or 'W' to write the strings,\n");
		printf("input 'r' or 'R' to read the stings,\n");
		printf("input 's' or 'S' to search the string,\n");
		printf("input 'p' or 'P' to replace the strings,\n");
		printf("input 'c' or 'C' to correct the strings.else,end.\n");

		char ch;
		ch=getchar();
		
		switch(ch)
		{
			case'w':
			case'W':
				
				printf("input the strings:\n");
				write();
				break;
			case'r':
			case'R':
				
				printf("read the strings:\n\n");
				read();
				getchar();

				break;

			case's':
			case'S':
				printf("\nsearch the strings:\n");
				search();
				break;
		
			case'p':
			case'P':		
				printf("\nreplace the strings.\n");
				replace(str,st,n);
				break;
	
			case'a':
			case'A':		
				printf("\ncorrect the strings:\n");
				add();
				break;
		
			default:
				printf("\nEnd this program.\n");
				break;
				
		}
	}
	
	return(0);
}



void write(void)
{
	FILE *fp;
	char ch;
	char string[50];

	if((fp=fopen("file2.txt","w"))==NULL)
	{
		printf("cannot open this file.");
		exit(0);
	}
	ch = getchar();
	gets(string);
	
	do
	{		
		fputs(string,fp);
		fputs("\n",fp);
	}while(strlen(gets(string))>0);
	printf("the file has been written.\n");
	fclose(fp);
}
void read(void)
{


	FILE *fp;
	char string[50];
	char * pBuf;
	char ch;

	if((fp=fopen("file2.txt","r"))==NULL)
	{
		printf("cannot open this file\n");
		exit(0);
	}
	ch = getchar();

	while((pBuf=fgets(string,10,fp))!=NULL)
		printf("%s",string);
	fclose(fp);
}

void search(void)
{
	FILE *fp;
	char string[50],str[10];
	char ch;
	char *pbuf;
	char *pp;
	if((fp=fopen("file2.txt","w"))==NULL)	

	{
		printf("cannot open this file.\n");
		exit(0);
	}
    
	ch = getchar();
	gets(str);

	if((pp=fgets(string,50,fp))!=NULL)
	{
		if((pbuf = strstr(string,str))!=NULL)
				printf("the strings you search is exist.\n\n"); 		
		printf("the strings you search is not exist\n\n");
		
	}
	fclose(fp);	

}

int replace(char str[],char st[],int n)
{
	FILE *fp;
	char string[50];	
	char *pbuf;
	char *pp;
	char ch;

	ch=getchar();
	gets(str);

	if((fp=fopen("file2.txt","w"))==NULL)
	{
		printf("cannot open this file\n");
		exit(0);
	}
	
	
		while((pp=fgets(string,50,fp))!=NULL)
		{
			if((pbuf=strstr(string,str))!=NULL)
			{
				printf("input the strings you want to replace:");
				gets(st);
				strcpy(str,st);
				printf("\n");
				read();
			}
			else 
				printf("the strings you search is not exist\n");
		}
	fclose(fp);	
	return(0);
}
void add(void)
{
	FILE *fp;
	char string[50],str[10],st[10];

	getchar();
	gets(str);
	if((fp=fopen("file2.txt","w"))==NULL)
	{
		printf("cannot open this file\n");
		exit(0);
	}
	while(strstr(string,str)!=NULL)
	{
		printf("the strings you search is exist");
		printf("then input strings you want to add:");
		gets(st);
		strcat(str,st);
	}
	fclose(fp);
}