experiment7

#include<stdio.h> int main(){ int num=0; char ch; FILE *fp; fp=fopen("D:\data4.txt","r"); if(fp==NULL) {printf("fail\n"); return 1;} while(!feof(fp)) ......

task4 //task4 #include<stdio.h> int main() { int i = 0; char ch; FILE *fp; fp = fopen("data4.txt", "r"); if(fp == NULL) { printf("读取失败\n"); return 1; ......