C MCQ set number 00721

1. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int mul(int a, int b, int c)
```
```
    {
```
```
        return a * b * c;
```
```
    }
```
```
    void main()
```
```
    {
```
```
        int *function_pointer;
```
```
        function_pointer = mul;
```

        printf("The product of three numbers is:%d",

```
        function_pointer(2, 3, 4));
```
```
    }
```

a) The product of three numbers is:24
b) Compile time error
c) Nothing
d) Varies

Answer

Answer: b [Reason:] None.

2. What is the output of this C code?

```
    #include <stdio.h>
```
```
    int sub(int a, int b, int c)
```
```
    {
```
```
        return a - b - c;
```
```
    }
```
```
    void main()
```
```
    {
```

        int (*function_pointer)(int, int, int);

```
        function_pointer = &sub;
```

        printf("The difference of three numbers is:%d",

```
        (*function_pointer)(2, 3, 4));
```
```
    }
```

a) The difference of three numbers is:1
b) Run time error
c) The difference of three numbers is:-5
d) Varies

Answer

Answer: c [Reason:] None.

3. One of the uses for function pointers in C is
a) Nothing
b) There are no function pointers in c
c) To invoke a function
d) To call a function defined at run-time.

Answer

Answer: d [Reason:] None.

4. What is the output of this C code?

```
    #include <stdio.h>
```
```
    void f(int);
```
```
    void (*foo)() = f;
```
```
    int main(int argc, char *argv[])
```
```
    {
```
```
        foo(10);
```
```
        return 0;
```
```
    }
```
```
    void f(int i)
```
```
    {
```
```
        printf("%dn", i);
```
```
    }
```

a) Compile time error
b) 10
c) Undefined behaviour
d) None of the mentioned

Answer

Answer: b [Reason:] None.

5. What is the output of this C code?

```
    #include <stdio.h>
```
```
    void f(int);
```
```
    void (*foo)(void) = f;
```
```
    int main(int argc, char *argv[])
```
```
    {
```
```
        foo(10);
```
```
        return 0;
```
```
    }
```
```
    void f(int i)
```
```
    {
```
```
        printf("%dn", i);
```
```
    }
```

a) Compile time error
b) 10
c) Undefined behaviour
d) None of the mentioned

Answer

Answer: a [Reason:] None.

6. What is the output of this C code?

```
    #include <stdio.h>
```
```
    void f(int);
```
```
    void (*foo)(float) = f;
```
```
    int main()
```
```
    {
```
```
        foo(10);
```
```
    }
```
```
    void f(int i)
```
```
    {
```
```
        printf("%dn", i);
```
```
    }
```

a) Compile time error
b) 10
c) 10.000000
d) Undefined behaviour

Answer

Answer: d [Reason:] None.

7. What is the output of this C code?

```
    #include <stdio.h>
```
```
    void f(int (*x)(int));
```
```
    int myfoo(int i);
```
```
    int (*foo)(int) = myfoo;
```
```
    int main()
```
```
    {
```
```
        f(foo(10));
```
```
    }
```
```
    void f(int (*i)(int))
```
```
    {
```
```
        i(11);
```
```
    }
```
```
    int myfoo(int i)
```
```
    {
```
```
        printf("%dn", i);
```
```
        return i;
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) 10 11
d) 10 Segmentation fault

Answer

Answer: d [Reason:] None.

8. What is the output of this C code?

```
    #include <stdio.h>
```
```
    void f(int (*x)(int));
```
```
    int myfoo(int);
```
```
    int (*foo)() = myfoo;
```
```
    int main()
```
```
    {
```
```
        f(foo);
```
```
    }
```
```
    void f(int(*i)(int ))
```
```
    {
```
```
        i(11);
```
```
    }
```
```
    int myfoo(int i)
```
```
    {
```
```
        printf("%dn", i);
```
```
        return i;
```
```
    }
```

a) 10 11
b) 11
c) 10
d) Undefined behaviour

Answer

Answer: b [Reason:] None.

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