File Input Output MCQs

What is the use of getchar()?

What will be the output of the following C code?

#include <stdio.h>
#include <stdarg.h>
int f(...);
int main()
{
    char c = 97;
    f(c);
    return 0;
}
int f(...)
{
    va_list li;
    char c = va_arg(li, char);
    printf("%c\n", c);
}

Which of the following data-types are promoted when used as a parameter for an ellipsis?

What is the value of EOF?

Which of these is a correct way to generate numbers between 0 to 1(inclusive) randomly?

log(x) function defined in math.h header file is . . . . . . . .

ungetc() may be used with . . . . . . . .

What will be the output of the following C code?

#include <stdio.h>
#include <math.h>
void main()
{
    int k = sqrt(-4);
    printf("%d\n", k);
}

stdout, stdin and stderr are . . . . . . . .