file_demo_2016_apr

// prog_file_demo.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

void demo01();
void demo02();
int _tmain(int argc, _TCHAR* argv[])
{
    //demo01();
    demo02();
    return 0;
}

void demo01()
{
    FILE *my_file;
    errno_t err;
    char symbol=0;
    err = fopen_s(&my_file, "file_demo.txt", "rt");
    if (err != 0)
    {
        printf("File not open, code %d", err);
        return;
    }
    while ((symbol = fgetc(my_file)) != EOF)
    {
        putchar(symbol);
    }
    fclose(my_file);
}

void demo02()
{
    FILE *my_file;
    errno_t err;
    //char str[90];
    char *str = (char *)malloc(90);
    if (str == NULL)
    {
        printf("No memory in demo02 %d", __LINE__);
        return;
    }
    err = fopen_s(&my_file, "file_demo.txt", "rt");
    if (err != 0)
    {
        printf("File not open, code %d", err);
        return;
    }
    while (str = fgets(str, 89, my_file))
    {
        int idx = strlen(str) - 1;
        if (str[idx] == '\n')
            str[idx] = '\0';
        puts(str);
    }
    fclose(my_file);
}