从命令提示符执行程序时，fgets出现问题

Question

scanf("%d",&a);

fflush(stdin);

fgets(ch,SIZE,stdin);    //SIZE=100 and ch is a char array

i have just used only this portion of code.It works fine normally.But when i am executing this programm from cmnd prmpt by using file.exe < input.txt > output.txt it's giving a garbage value in output.txt file.

Answer 1

You can flush stdin using getchar or fgetc(stdin) :

static void flush_stdin(void)
{
    int c;

    while ((c = fgetc(stdin)) != '\n' && c != EOF);
}

scanf("%d",&a);
flush_stdin();
fgets(ch,SIZE,stdin);    //SIZE=100 and ch is a char array