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回复 1# Gin_Q

#include<cstdio>
#define 	MAX		1024

char Char_now=' ';
char Str_replace_from[MAX]="no";
char Str_replace_as  [MAX]="88";
char Str_already_mark[MAX]="";
FILE *fin =NULL;
FILE *fout=NULL;
int Num_mark_distence=0;

int main()
{
	fin =fopen("text.txt"  ,"r");
	fout=fopen("result.txt","w");
	// 比较字符串
	while(fscanf(fin,"%c",&Char_now)!=EOF){
		// 写入字串 
		Str_already_mark[Num_mark_distence  ]=Char_now;
		Str_already_mark[Num_mark_distence+1]=0;
		if( Str_replace_from[Num_mark_distence] == Str_already_mark[Num_mark_distence] ){
			// 若对比到当前位仍相同 
			if( Str_replace_from[Num_mark_distence+1] == 0 ){
				// 若整个字串对比完
				fprintf(fout,"%s",Str_replace_as );
				Num_mark_distence=0;
			}
			else
				Num_mark_distence++; 
		}
		else{
			// 若当前位不相同
			fprintf(fout,"%s",Str_already_mark);
			Num_mark_distence=0;
		} 
	}
	fclose(fin );
	fclose(fout);
}
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杠精路过

刚刚又想了一下，空间占用可以更小。。。。。。。为此多了一行代码

#include<cstdio>
#define MAX 1024

char Char_now=' ';
char Char_end=' '; 
char Str_replace_from[MAX]="as";
char Str_replace_as  [MAX]="AS";
FILE *fin =NULL;
FILE *fout=NULL;
int  Num_mark_distence=0;

int main()
{
	fin =fopen("text.txt"  ,"r");
	fout=fopen("result.txt","w");
	// 比较字符串 
	while(fscanf(fin,"%c",&Char_now)!=EOF){
		// 读入字符 
		if( Str_replace_from[Num_mark_distence] == Char_now ){
			// 若对比到当前位仍相同 
			if( Str_replace_from[Num_mark_distence+1] == 0 ){
				// 若整个字串对比完 
				fprintf(stdout,"%s",Str_replace_as );
				Num_mark_distence=0;
			}
			else
				Num_mark_distence++; 
		}
		else{
			// 若当前位不相同 
			Char_end=Str_replace_from[Num_mark_distence]; 
			Str_replace_from[Num_mark_distence]=0;
			fprintf(stdout,"%s%c",Str_replace_from,Char_now);
			Str_replace_from[Num_mark_distence]=Char_end;
			Num_mark_distence=0;
		} 
	}
	fclose(fin );
	fclose(fout);
}
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