File Input Output MCQs

What will be the output of the following C code?

#include <stdio.h>
#include <string.h>
int main()
{
    char *str = "hello, world";
    char str1[9];
    strncpy(str1, str, 9);
    printf("%s %d", str1, strlen(str1));
}

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);
}

What will be the output of the following C code?

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

What is function srand(unsigned)?

What is the purpose of the C function?

int ferror(FILE *fp)

What if size is zero in the following C statement?

realloc(ptr, size)

Select the right explanation to the given code.

printf(“%*. *f”, 5,4,5700);

Which of the following should be used for freeing the memory allocated in the following C code?

#include <stdio.h>
struct p
{
    struct p *next;
    int x;
};
int main()
{
    struct p *p1 = (struct p*)malloc(sizeof(struct p));
    p1->x = 1;
    p1->next = (struct p*)malloc(sizeof(struct p));
    return 0;
}

free(p1);
free(p1->next)

free(p1->next);
free(p1);

free(p1);

Which of the following function with ellipsis are illegal?