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
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.
Address of pointer ab : 0x7ffcc3ad291c
Content of pointer ab : 29
The value of m assigned to 34 now.
Address of pointer ab : 0x7ffcc3ad291c
Content of pointer ab : 34
The pointer variable ab is assigned with the value 7 now.
Address of m : 0x7ffcc3ad291c
Value of m : 7
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 :
-----------------------
address of m = 0x7ffda2eeeec8
address of fx = 0x7ffda2eeeecc
address of cht = 0x7ffda2eeeec7
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 :
----------------------------------
address of m = 0x7ffda2eeeec8
address of fx = 0x7ffda2eeeecc
address of cht = 0x7ffda2eeeec7
Using only pointer operator :
----------------------------------
value at address of m = 300
value at address of fx= 300.600006
value at address of cht= z
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
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
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.
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
8. Write a program in C to print all permutations of a given string using pointers.
Expected Output :
The permutations of the string are : abcd abdc acbd acdb adcb adbc bacd badc bcad bcda bdca bdac cbad cbda cabd cadb cdab cdba db ca dbac dcba dcab dacb dabc
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
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
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
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
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
14. Write a program in C to sort an array using a pointer.
Test Data :
testdata
Expected Output :
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
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.
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
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
18. Write a program in C to demonstrate the use of pointers to structures.
Expected Output :
John Alter from Court Street
19. Write a program in C to show a pointer to a union.
Expected Output :
Jhon Mc Jhon Mc
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
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
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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