The code is as follows.

// EOF example.cpp: Define the entry point of the console application.
//

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>

int main()
{
　　char ch;
　　FILE *f;
　　char a[300];
　　printf("enter the file name:");
　　scanf("%s", a);
　　f = fopen(a,"r");


　　if (f == NULL)
　　{
　　　　printf("failed to open file. ");
　　　　exit(1);
　　}
　　while (( ch=getc(f)) != EOF)
　　{
　　　　putchar(ch);
　　}
　　fclose(f);
　　getchar();
　　return 0;
}

 

Solution: project property page (ALT + F7) – > Configuration properties – > C++ -> Code generation – > Basic runtime check defaults

But it can’t solve the problem, so I set the input. TXT file format to ANSI instead of UTF-8 or Unicode, which is correct

In addition, when using scanf and fopen functions, the solution is as follows

Right click the project name – > Attributes – > C/C++–> Preprocessor – > To define the preprocessor, edit the input box on the right and add:
to it_ CRT_ SECURE_ NO_ WARNINGS