Character Pointers - C Programming Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Character Pointers and Functions – 2”.

Pre-requisite for C Character Pointers and Functions MCQ set: Video Tutorial on C Pointers.

1. Comment on the output of the following C code.

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        char *str = "This" //Line 1
```

        char *ptr = "Program\n"; //Line 2

```
        str = ptr; //Line 3
```

        printf("%s, %s\n", str, ptr); //Line 4

```
    }
```

a) Memory holding “this” is cleared at line 3
b) Memory holding “this” loses its reference at line 3
c) You cannot assign pointer like in Line 3
d) Output will be This, Program
View Answer

Answer: b
Explanation: None.

2. What type of initialization is needed for the segment “ptr[3] = ‘3’;” to work?
a) char *ptr = “Hello!”;
b) char ptr[] = “Hello!”;
c) both char *ptr = “Hello!”; and char ptr[] = “Hello!”;
d) none of the mentioned
View Answer

Answer: b
Explanation: None.

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3. What is the syntax for constant pointer to address (i.e., fixed pointer address)?
a) const <type> * <name>
b) <type> * const <name>
c) <type> const * <name>
d) none of the mentioned
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int add(int a, int b)
```
```
    {
```
```
        return a + b;
```
```
    }
```
```
    int main()
```
```
    {
```
```
        int (*fn_ptr)(int, int);
```
```
        fn_ptr = add;
```

        printf("The sum of two numbers is: %d", (int)fn_ptr(2, 3));

```
    }
```

a) Compile time error, declaration of a function inside main
b) Compile time error, no definition of function fn_ptr
c) Compile time error, illegal application of statement fn_ptr = add
d) No Run time error, output is 5
View Answer

Answer: d
Explanation: None.

5. What is the correct way to declare and assign a function pointer?

(Assuming the function to be assigned is "int multi(int, int);")

a) int (*fn_ptr)(int, int) = multi;
b) int *fn_ptr(int, int) = multi;
c) int *fn_ptr(int, int) = &multi;
d) none of the mentioned
View Answer

Answer: a
Explanation: None.

6. Calling a function f with a an array variable a[3] where a is an array, is equivalent to __________
a) f(a[3])
b) f(*(a + 3))
c) f(3[a])
d) all of the mentioned
View Answer

Answer: d
Explanation: None.

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