C语言程序设计 单词替换程序

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void main(){
FILE *fp1,*fp2;
int i,lenstr2,k=0,m;
static int j,h;
char str1[100],path[128],str2[10],str3[10],path_new[128],ch,strtemp[50],*p;

  printf("请输入需要进行操作文件的文件名\n");
gets(path);
printf("请您确认\n");
puts(path);
if((fp1=fopen(path,"r+"))==NULL){
printf("can not open the file\n");
exit(0);}
printf("请输入新文件名\n");
gets(path_new);
if((fp2=fopen(path_new,"w"))==NULL){
printf("can not open the file\n");
exit(0);
}

for(i=0;(feof(fp1)==0);i++){
ch=fgetc(fp1);
str1[i]=ch;
j=i;
}
for(i=0;i<j;i++){
printf("%c",str1[i]);}