Test: Standard Input & Output - Class 6 MCQ

What is the return value of putchar()?

What will be the output of the following C code?

    #include <stdio.h>
    int main()
    {
        char c = '�';
        putchar(c);
    }

What will be the output of the following C code if following commands are used to run (considering myfile exists)?

    gcc -otest test.c
    ./test < myfile
 
    #include <stdio.h>
    int main()
    {
        char c = 'd';
        putchar(c);
    }

What will be the output of the following C code if following commands are used to run and if myfile does not exist?

    gcc -o test test.c
    ./test > myfile
 
    #include <stdio.h>
    int main(int argc, char **argv)
    {
        char c = 'd';
        putchar(c);
        printf(" %d\n", argc);
    }

Which among the following is the odd one out?

What does the following command line signify?

prog1|prog2

What is the value of EOF?