File Input Output MCQs

What will be the output of the following C code?

#include <stdio.h>
#include <ctype.h>
int main()
{
    char i = 9;
    if (isdigit(i))
        printf("digit\n");
    else
        printf("not digit\n");
        return 0;
}

Which of the following causes an error?

Which header file includes a function for variable number of arguments?

fputs() adds newline character.

For binary files, a . . . . . . . . must be appended to the mode string.

The type va_list in an argument list is used . . . . . . . .

The standard header . . . . . . . . is used for variable list arguments (...) in C.

Which one of the following is correct syntax for opening a file.

What will be the output of the following C code (when 4 and 5 are entered)?

#include <stdio.h>
void main()
{
    int m, n;
    printf("enter a number");
    scanf("%d", &n);
    scanf("%d", &m);
    printf("%d\t%d\n", n, m);
}