# C Programming Exercises, Practice, Solution : Pointer

## C Pointer [22 exercises with solution]

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1. Write a program in C to show the basic declaration of a pointer.
Expected Output :

``` Pointer : Show the basic declaration of pointer :
-------------------------------------------------------
Here is m=10, n and o are two integer variable and *z is an integer

z stores the address of m  = 0x7ffd40630d44

*z stores the value of m = 10

&m is the address of m = 0x7ffd40630d44

&n stores the address of n = 0x7ffd40630d48

&o  stores the address of o = 0x7ffd40630d4c

&z stores the address of z = 0x7ffd40630d50
```

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2. Write a program in C to demonstrate how to handle pointers in a program.
Expected Output :

```Address of m : 0x7ffcc3ad291c
Value of m : 29

Now ab is assigned with the address of m.
Content of pointer ab : 29

The value of m assigned to 34 now.
Content of pointer ab : 34

The pointer variable ab is assigned with the value 7 now.
Value of m : 7
```

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3. Write a program in C to demonstrate the use of the &(address of) and *(value at address) operators.
Expected Output :

```Pointer : Demonstrate the use of & and * operator :
--------------------------------------------------------
m = 300
fx = 300.600006
cht = z

Using & operator :
-----------------------

Using & and * operator :
-----------------------------
value at address of m = 300
value at address of fx = 300.600006
value at address of cht = z

Using only pointer variable :
----------------------------------

Using only pointer operator :
----------------------------------
value at address of m = 300
value at address of fx= 300.600006
value at address of cht= z
```

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4. Write a program in C to add two numbers using pointers.
Test Data :
Input the first number : 5
Input the second number : 6
Expected Output :

```The sum of the entered numbers is : 11
```

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5. Write a program in C to add numbers using call by reference.
Test Data :
Input the first number : 5
Input the second number : 6
Expected Output :

``` The sum of 5 and 6  is 11
```

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6. Write a program in C to find the maximum number between two numbers using a pointer.
Test Data :
Input the first number : 5
Input the second number : 6
Expected Output :

```6 is the maximum number.
```

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7. Write a program in C to store n elements in an array and print the elements using a pointer.
Test Data :
Input the number of elements to store in the array :5
Input 5 number of elements in the array :
element - 0 : 5
element - 1 : 7
element - 2 : 2
element - 3 : 9
element - 4 : 8
Expected Output :

``` The elements you entered are :
element - 0 : 5
element - 1 : 7
element - 2 : 2
element - 3 : 9
element - 4 : 8
```

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8. Write a program in C to print all permutations of a given string using pointers.
Expected Output :

```The permutations of the string are :
ca  dbac  dcba  dcab  dacb  dabc
```

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9. Write a program in C to find the largest element using Dynamic Memory Allocation.
Test Data :
Input total number of elements(1 to 100): 5

Number 1: 5
Number 2: 7
Number 3: 2
Number 4: 9
Number 5: 8
Expected Output :

```The Largest element is :  9.00
```

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10. Write a program in C to calculate the length of a string using a pointer.
Test Data :
Input a string : w3resource
Expected Output :

```The length of the given string w3resource
is : 10
```

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11. Write a program in C to swap elements using call by reference.
Test Data :
Input the value of 1st element : 5
Input the value of 2nd element : 6
Input the value of 3rd element : 7
Expected Output :

```The value before swapping are :
element 1 = 5
element 2 = 6
element 3 = 7

The value after swapping are :
element 1 = 7
element 2 = 5
element 3 = 6
```

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12. Write a program in C to find the factorial of a given number using pointers.
Test Data :
Input a number : 5
Expected Output :

```The Factorial of 5 is : 120
```

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13. Write a program in C to count the number of vowels and consonants in a string using a pointer.
Test Data :
Input a string: string
Expected Output :

```Number of vowels : 1
Number of constant : 5
```

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14. Write a program in C to sort an array using a pointer.
Test Data :
testdata
Expected Output :

Test Data :
Input the number of elements to store in the array : 5
Input 5 number of elements in the array :
element - 1 : 25
element - 2 : 45
element - 3 : 89
element - 4 : 15
element - 5 : 82
Expected Output :

```
The elements in the array after sorting :
element - 1 : 15
element - 2 : 25
element - 3 : 45
element - 4 : 82
element - 5 : 89
```

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15. Write a C program to demonstrate how a function returns a pointer.
Test Data :
Input the first number : 5
Input the second number : 6
Expected Output :

``` The number 6 is larger.
```

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16. Write a program in C to compute the sum of all elements in an array using pointers.
Test Data :
Input the number of elements to store in the array (max 10) : 5
Input 5 number of elements in the array :
element - 1 : 2
element - 2 : 3
element - 3 : 4
element - 4 : 5
element - 5 : 6
Expected Output :

``` The sum of array is : 20
```

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17. Write a program in C to print the elements of an array in reverse order.
Test Data :
Input the number of elements to store in the array (max 15) : 5
Input 5 number of elements in the array :
element - 1 : 2
element - 2 : 3
element - 3 : 4
element - 4 : 5
element - 5 : 6
Expected Output :

``` The elements of array in reverse order are :
element - 5 : 6
element - 4 : 5
element - 3 : 4
element - 2 : 3
element - 1 : 2
```

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18. Write a program in C to demonstrate the use of pointers to structures.
Expected Output :

``` John Alter from Court Street
```

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19. Write a program in C to show a pointer to a union.
Expected Output :

```Jhon Mc Jhon Mc
```

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20. Write a program in C to show a pointer to an array whose contents are pointers to structures.
Expected Output :

``` Exmployee Name : Alex
Employee ID :  1002
```

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21. Write a program in C to print all the alphabets using a pointer.
Expected Output :

```The Alphabets are :
A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z
```

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22. Write a program in C to print a string in reverse using a pointer.
Test Data :
Input a string : w3resource
Expected Output :

``` Pointer : Print a string in reverse order :
------------------------------------------------
Input a string : w3resource
Reverse of the string is : ecruoser3w
```

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