Interview Questions on while loop

What is the output of this C code?
    #include <stdio.h>
    int main()
    {
        while ()
            printf("In while loop ");
        printf("After loop\n");
    }
a) In while loop after loop
b) After loop
c) Compile time error
d) Infinite loop

Answer:c

What is the output of this C code?
    #include <stdio.h>
    int main()
    {
        do
            printf("In while loop ");
        while (0);
            printf("After loop\n");
    }
a) In while loop
b) In while loop
after loop
c) After loop
d) Infinite loop

Answer:b

What is the output of this C code?
    #include <stdio.h>
    int main()
    {
        int i = 0;
        do {
            i++;
            printf("In while loop\n");
        } while (i < 3);
    }
a) In while loop
In while loop
In while loop
b) In while loop
In while loop
c) Depends on the compiler
d) Compile time error

Answer:a

How many times i value is checked in the below code?
    #include <stdio.h>
    int main()
    {
        int i = 0;
        do {
            i++;
            printf("in while loop\n");
        } while (i < 3);
    }
a) 2
b) 3
c) 4
d) 1

Answer:b

How many times i value is checked in the below code?
    #include <stdio.h>
    int main()
    {
        int i = 0;
        while (i < 3)
            i++;
        printf("In while loop\n");
    }
a) 2
b) 3
c) 4
d) 1

Answer:c

What is the output of this C code?
    #include <stdio.h>
    void main()
    {
        int i = 2;
        do
        {
            printf("Hi");
        } while (i < 2)
    }
a) Compile time error
b) Hi Hi
c) Hi
d) Varies

Answer:a

What is the output of this C code?
    #include <stdio.h>
    void main()
    {
        int i = 0;
        while (++i)
        {
            printf("H");
        }
    }
a) H
b) H is printed infinite times
c) Compile time error
d) Varies

Answer:b

What is the output of this C code?
    #include <stdio.h>
    void main()
    {
        int i = 0;
        do
        {
            printf("Hello");
        } while (i != 0);
    }
a) Nothing
b) H is printed infinite times
c) Hello
d) Run time error

Answer: c
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