250+ TOP MCQs on Typedefs and Answers [2024]

C programming questions on “Typedefs”. One shall practice these questions to improve their C programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C Programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C programming questions come with detailed explanation of the answers which helps in better understanding of C concepts.

Here is a listing of C programming questions on “Typedefs” along with answers, explanations and/or solutions:

1. What will be the output of the following C code?

```
    #include 
```
```
    typedef struct student
```
```
    {
```
```
        char *a;
```
```
    }stu;
```
```
    void main()
```
```
    {
```
```
        struct stu s;
```
```
        s.a = "hi";
```
```
        printf("%s", s.a);
```
```
    }
```

a) Compile time error
b) Varies
c) hi
d) h
Answer: a
Clarification: None.

2. What will be the output of the following C code?

```
    #include 
```
```
    typedef struct student
```
```
    {
```
```
        char *a;
```
```
    }stu;
```
```
    void main()
```
```
    {
```
```
        struct student s;
```
```
        s.a = "hey";
```
```
        printf("%s", s.a);
```
```
    }
```

a) Compile time error
b) Varies
c) he
d) hey
Answer: d
Clarification: None.

3. What will be the output of the following C code?

```
    #include 
```
```
    typedef int integer;
```
```
    int main()
```
```
    {
```
```
        int i = 10, *ptr;
```
```
        float f = 20;
```
```
        integer j = i;
```
```
        ptr = &j;
```
```
        printf("%dn", *ptr);
```
```
        return 0;
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) Depends on the standard
d) 10
Answer: d
Clarification: None.

4. What will be the output of the following C code?

```
    #include 
```
```
    int (*(x()))[2];
```
```
    typedef int (*(*ptr)())[2] ptrfoo;
```
```
    int main()
```
```
    {
```
```
        ptrfoo ptr1;
```
```
        ptr1 = x;
```
```
        ptr1();
```
```
        return 0;
```
```
    }
```
```
    int (*(x()))[2]
```
```
    {
```

        int (*ary)[2] = malloc(sizeof*ary);

```
        return &ary;
```
```
    }
```

a) Compile time error
b) Nothing
c) Undefined behaviour
d) Depends on the standard
Answer: a
Clarification: None.

5. What will be the output of the following C code?

```
    #include 
```
```
    int *(*(x()))[2];
```
```
    typedef int **(*ptrfoo)())[2];
```
```
    int main()
```
```
    {
```
```
        ptrfoo ptr1;
```
```
        ptr1 = x;
```
```
        ptr1();
```
```
        return 0;
```
```
    }
```
```
    int *(*(x()))[2]
```
```
    {
```

        int (*ary)[2] = malloc(sizeof * ary);

```
        return &ary;
```
```
    }
```

a) Compile time error
b) Nothing
c) Undefined behaviour
d) Depends on the standard
Answer: b
Clarification: None.

6. What will be the output of the following C code?

```
    #include 
```
```
    typedef struct p
```
```
    {
```
```
        int x, y;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        p k1 = {1, 2};
```
```
        printf("%dn", k1.x);
```
```
    }
```

a) Compile time error
b) 1
c) 0
d) Depends on the standard
Answer: a
Clarification: None.

7. What will be the output of the following C code?

```
    #include 
```
```
    typedef struct p
```
```
    {
```
```
        int x, y;
```
```
    }k = {1, 2};
```
```
    int main()
```
```
    {
```
```
        p k1 = k;
```
```
        printf("%dn", k1.x);
```
```
    }
```

a) Compile time error
b) 1
c) 0
d) Depends on the standard
Answer: a
Clarification: None.

8. What will be the output of the following C code?

```
    #include 
```
```
    typedef struct p
```
```
    {
```
```
        int x, y;
```
```
    }k;
```
```
    int main()
```
```
    {
```
```
        struct p p = {1, 2};
```
```
        k k1 = p;
```
```
        printf("%dn", k1.x);
```
```
    }
```

a) Compile time error
b) 1
c) 0
d) Depends on the standard
Answer: b
Clarification: None.

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