C MCQ set number 00717

1. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        char x : 2;
```
```
        int y : 2;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        struct p p;
```
```
        p.x = 2;
```
```
        p.y = 1;
```
```
        p.x = p.x & p.y;
```
```
        printf("%dn", p.x);
```
```
    }
```

a) 0
b) Compile time error
c) Undefined behaviour
d) Depends on the standard

Answer

Answer: a [Reason:] None.

2. What is the output of this C code?

```
    #include <stdio.h>
```
```
    union u
```
```
    {
```
```
        struct p
```
```
        {
```
```
            unsigned char x : 2;
```
```
            unsigned int y : 2;
```
```
        };
```
```
        int x;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        union u u;
```
```
        u.p.x = 2;
```
```
        printf("%dn", u.p.x);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) Depends on the standard
d) 2

Answer

Answer: a [Reason:] None.

3. What is the output of this C code?

```
    #include <stdio.h>
```
```
    union u
```
```
    {
```
```
        struct
```
```
        {
```
```
            unsigned char x : 2;
```
```
            unsigned int y : 2;
```
```
        }p;
```
```
        int x;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        union u u;
```
```
        u.p.x = 2;
```
```
        printf("%dn", u.p.x);
```
```
    }
```

a) Compile time error
b) 2
c) Undefined behaviour
d) Depends on the standard

Answer

Answer: b [Reason:] None.

4. What is the output of this C code?

```
    #include <stdio.h>
```
```
    union u
```
```
    {
```
```
        struct
```
```
        {
```
```
            unsigned char x : 2;
```
```
            unsigned int y : 2;
```
```
        }p;
```
```
        int x;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        union u u.p.x = 2;
```
```
        printf("%dn", u.p.x);
```
```
    }
```

a) Compile time error
b) 2
c) Depends on the compiler
d) Depends on the standard

Answer

Answer: a [Reason:] None.

5. What is the output of this C code?

```
    #include <stdio.h>
```
```
    union u
```
```
    {
```
```
        struct
```
```
        {
```
```
            unsigned char x : 2;
```
```
            unsigned int y : 2;
```
```
        }p;
```
```
        int x;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        union u u = {2};
```
```
        printf("%dn", u.p.x);
```
```
    }
```

a) Compile time error
b) 2
c) Depends on the standard
d) None of the mentioned

Answer

Answer: b [Reason:] None.

6. What is the output of this C code?

```
    #include <stdio.h>
```
```
    union u
```
```
    {
```
```
        struct
```
```
        {
```
```
            unsigned char x : 2;
```
```
            unsigned int y : 2;
```
```
        }p;
```
```
        int x;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        union u u.p = {2};
```
```
        printf("%dn", u.p.x);
```
```
    }
```

a) Compile time error
b) 2
c) Undefined behaviour
d) None of the mentioned

Answer

Answer: a [Reason:] None.

7. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        unsigned int x : 2;
```
```
        unsigned int y : 2;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        struct p p;
```
```
        p.x = 3;
```
```
        p.y = 1;
```
```
        printf("%dn", sizeof(p));
```
```
    }
```

a) Compile time error
b) Depends on the compiler
c) 2
d) 4

Answer

Answer: d [Reason:] None.

8. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        unsigned int x : 2;
```
```
        unsigned int y : 2;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        struct p p;
```
```
        p.x = 3;
```
```
        p.y = 4;
```
```
        printf("%dn", p.y);
```
```
    }
```

a) 0
b) 4
c) Depends on the compiler
d) 2

Answer

Answer: a [Reason:] None.

9. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        unsigned int x : 7;
```
```
        unsigned int y : 2;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        struct p p;
```
```
        p.x = 110;
```
```
        p.y = 2;
```
```
        printf("%dn", p.x);
```
```
    }
```

a) Compile time error
b) 110
c) Depends on the standard
d) None of the mentioned

Answer

Answer: b [Reason:] None.

10. What is the output of this C code?

```
    #include <stdio.h>
```
```
    struct p
```
```
    {
```
```
        unsigned int x : 1;
```
```
        unsigned int y : 1;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        struct p p;
```
```
        p.x = 1;
```
```
        p.y = 2;
```
```
        printf("%dn", p.y);
```
```
    }
```

a) 1
b) 2
c) 0
d) Depends on the compiler

Answer

Answer: c [Reason:] None.

DistPub Team

Distance Publisher (DistPub.com) provide project writing help from year 2007 and provide writing and editing help to hundreds student every year.