Информатика_1 / C / lecture9 / findrepl

#include<stdio.h>
#include<string.h> 
#include<stdlib.h>
void main(void){
char *s="for",*s1="while",a[255],*b,temp[255];
long l,i;
FILE *str,*str1;
if(!(str=fopen("text.txt","rb"))){perror("error opening text.txt\n");
exit(1);
}
str1=fopen("text1.txt","wb");
while(!feof(str)){
	fgets(a,255,str); 
b=strstr(a,s);
if(b!=NULL) {
	l=b-a;
	for(i=0;i<l;i++)temp[i]=a[i];
	temp[l]=0;
	strcat(temp,s1);
	strcat(temp,b+strlen(s));
	fputs(temp,str1);
}
}

fclose(str1);
fclose(str);
}