C MCQ set number 00690

1. What is the output of this C code?

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        char *s = "hello";
```
```
        char *p = s * 3;
```
```
        printf("%ct%c", *p, s[1]);
```
```
    }
```

a) h e
b) l e
c) Compile time error
d) l h

Answer

Answer: c [Reason:] None.

2. What is the output of this C code?

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        char *s= "hello";
```
```
        char *p = s + 2;
```
```
        printf("%ct%c", *p, s[1]);
```
```
    }
```

a) l e
b) h e
c) l l
d) h l

Answer

Answer: a [Reason:] None.

3. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        void *p;
```
```
        int a[4] = {1, 2, 3, 8};
```
```
        p = &a[3];
```
```
        int *ptr = &a[2];
```
```
        int n = p - ptr;
```
```
        printf("%dn", n);
```
```
    }
```

a) 1
b) Compile time error
c) Segmentation fault
d) 4

Answer

Answer: b [Reason:] None.

4. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        void *p;
```
```
        int a[4] = {1, 2, 3, 4};
```
```
        p = &a[3];
```
```
        int *ptr = &a[2];
```
```
        int n = (int*)p - ptr;
```
```
        printf("%dn", n);
```
```
    }
```

a) 1
b) Compile time error
c) Segmentation fault
d) 4

Answer

Answer: a [Reason:] None.

5. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a[4] = {1, 2, 3, 4};
```
```
        int b[4] = {1, 2, 3, 4};
```
```
        int n = &b[3] - &a[2];
```
```
        printf("%dn", n);
```
```
    }
```

a) -3
b) 5
c) 4
d) Compile time error

Answer

Answer: a [Reason:] None.

6. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a[4] = {1, 2, 3, 4};
```
```
        int *p = &a[1];
```
```
        int *ptr = &a[2];
```
```
        ptr = ptr * 1;
```
```
        printf("%dn", *ptr);
```
```
    }
```

a) 2
b) 1
c) Compile time error
d) Undefined behaviour

Answer

Answer: c [Reason:] None.

7. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a[4] = {1, 2, 3, 4};
```
```
        int *ptr  =  &a[2];
```
```
        float n = 1;
```
```
        ptr = ptr + n;
```
```
        printf("%dn", *ptr);
```
```
    }
```

a) 4
b) 3
c) Compile time error
d) Undefined behaviour

Answer

Answer: c [Reason:] None.

8. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int a[4] = {1, 2, 3, 4};
```
```
        void *p = &a[1];
```
```
        void *ptr = &a[2];
```
```
        int n = 1;
```
```
        n = ptr - p;
```
```
        printf("%dn", n);
```
```
    }
```

a) 1
b) 4
c) Compile time error
d) Depends on the compiler

Answer

Answer: b [Reason:] None.

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