File Input Output MCQs

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    short int i;
    scanf("%hd", &i);
    printf("%hd", i);
    return 0;
}

fflush(NULL) flushes all . . . . . . . .

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    FILE *fp = stdout;
    int n;
    fprintf(fp, "%d\n ", 45);
    fprintf(stderr, "%d ", 65);
    return 0;
}

What will fopen will return, if there is any error while opening a file?

Which of the following is the right declaration for fgets() inside the library?

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    int i = 10, j = 3;
    printf("%d %d %d", i, j);
}

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    char *n;
    scanf("%s", n);
    return 0;
}

Which of the following fopen() statements are illegal?

The syntax of printf() function is printf("control string", variable list) ;what is the prototype of the control string?