File Input Output MCQs

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    char n[] = "hello\nworld!";
    char s[13];
    sscanf(n, "%s", s);
    printf("%s\n", s);
    return 0;
}

What will be the output of the following C code?

#include <stdio.h>
#include <ctype.h>
int main()
{
    int i = 32;
    if (isspace(i))
        printf("space\n");
    else
        printf("not space\n");
        return 0;
}

What will be the output of the following C code?

#include <stdio.h>
#include <stdarg.h>
int f(int c, ...);
int main()
{
    int c = 97;
    float d = 98;
    f(c, d);
    return 0;
}
int f(int c, ...)
{
    va_list li;
    va_start(li, c);
    float d = va_arg(li, float);
    printf("%f\n", d);
    va_end(li);
}

The functions vprintf(), vfprintf(), and vsprintf() are not equivalent to the corresponding printf() functions except the variable argument list.

Which is true about isalnum(c), where c is an int that can be represented as an unsigned?

char or EOF.isalnum(c) returns

Which of the following is used during memory deallocation in C?

What is the difference in the ASCII value of capital and non-capital of the same letter is?

In the following C program, every time program is run different numbers are generated.

#include <stdio.h>
int main()
{
    srand(time(NULL));
    printf("%d\n", rand());
    return 0;
}

What will be the output of the following C code?

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