What are Programming Languages?Types of softwaresC IntroductionC HistoryC FeaturesC ApplicationsCharacter set, ASCII TableC Programming Language Standard
Turbo C++ editor installationExploring the Turbo C++ EnvironmentC Hellow world programHow a C Program ExecuteCompilation process in C
C #include statementC Displaying OutputC Reading input from the terminalC Data typesC VariablesC Variable Naming ConventionsC ConstantsC Identifiers & Naming RulesC LiteralsC CommentsC KeywordsC Type QualifiersC TokensC Format SpecifiersC Escape SequencesC preprocessorASCII value in CStatic in CWhat are Compiler ErrorsWhat are Compiler WarningsWhat are Linker ErrorsWhat are Runtime ErrorsWhat are Logical ErrorsCompile time vs RuntimeC program to displays your name  C - Basics Practice Test.1  C - Basics Practice Test.2  C - Basics Practice Test.3  C - Basics Practice Test.4  C - Basics Practice Test.5
C Arithmetic OperatorsC Assignment OperatorsC Relational OperatorsC Logical OperatorsC Increment & Decrement OperatorsC Conditional or Ternary OperatorC Bitwise OperatorsC Type CastingC Sizeof OperatorC Comma OperatorC Operators Precedence and AssociativityC ExpressionsC Evaluation of Expressions  C - Operators Practice Test.1  C - Operators Practice Test.2  C - Operators Practice Test.3
Input-Output Library FunctionsNon-Formatted Input and OutputCharacter Oriented Library FunctionsFormatted Library FunctionsMathematical Library Functions  C - Input-Output Functions Practice Test.1
C ifC if-elseC nested if-elseC if-else-ifC switch-caseC if vs switch-caseC LoopsC while loopC do-while loopC while vs do-whileC for loopC for vs WhileC Nested LoopsC Jump Control structuresC break statementC continue statementC goto statementC continue vs goto statementC return statementC goto vs return statement  C - Control Statements Practice Test.1  C - Control Statements Practice Test.2  C - Control Statements Practice Test.3
C FunctionsC Advantages of Using FunctionsC Function PrototypeC Basic Function DesignsC Programs Using FunctionsC ScopeC Local Variable and Global VariableWhy int main() return 03 Place to declare functionsC RecursionC Base Condition in RecursionC Iteration vs RecursionC Stack Overflow Error in RecursionC Nested functionsC Variable Length Number of ArgumentsC Parameter Passing – Call by value and Call by RefC Passing Strings to FunctionsImplementation of square() functionImplementation of factorial() functionImplementation of pow(x, n) functionImplementation of reverse(int) functionImplementation of countDigits(int) functionImplementation of palindrome(int) functionImplementation of primeNumber(int) function  C - Functions Practice Test.1  C - Functions Practice Test.2
What is Array?One dimensional ArrayAccessing element of 1D arrayReading and displaying elementsPrograms on 1D ArraysTwo Dimensional ArrayAccessing Element of 2D ArrayReading and Displaying ElementsPrograms on 2D ArraysPassing 1D arrays to FunctionsPassing 2D arrays to FunctionsThree Dimensional Array  C - Array Practice Test.1  C - Array Practice Test.2
Strings in CStoring StringsC The String DelimiterC String Literals (String Constants)C Strings vs. CharactersC Declaring and Initialization of StringsC Strings and the Assignment OperatorC String Input Functions / Reading StringsC String Output Functions / Writing StringsC fscanf() and fprintf() FunctionsC Single Character Library FunctionsC String Manipulation Library FunctionsC Programs Using Character ArraysC Array of StringsC Programs Using Array of Strings  C - Strings Practice Test.1  C - Strings Practice Test.2
Pointers in CUnderstanding Memory AddressesDeclare and Initialize Pointer VariablePointer Operators in Csizeof() Operator in CPointer Advantages and DisadvantagesDereferencing/Redirecting Pointer VariablesPointer Declaration versus RedirectionConst Pointer in CVoid Pointer in CNull Pointer in CC Pointer CompatibilityArray of PointersPointer to PointerPointer ArithmeticC Functions Returning PointersC Pointer to FunctionPointers and One-Dimensional ArrayPointers and Two-Dimensional ArrayPointers and StringsDynamic Memory Allocation Functions  C - Pointers Practice Test.1  C - Pointers Practice Test.2  C - Pointers Practice Test.3
Previous
Next

Pointer Arithmetic in C

Pointer arithmetic in C allows you to perform arithmetic operations on pointers, such as adding or subtracting integers to/from pointers, which is useful when working with arrays and memory management. It allows you to navigate through memory locations efficiently.

#include <stdio.h>

int main() {
int arr[] = {10, 20, 30, 40, 50};
int *ptr = arr; // Pointer to the first element of the array

printf("Initial address: %p\n", ptr);

// Move the pointer to the next element
ptr++;

printf("After incrementing: %p\n", ptr);

// Access and print the value at the new location
printf("Value at the new location: %d\n", *ptr);

// Subtract 2 from the pointer to go back two elements
ptr -= 2;

printf("After decrementing by 2: %p\n", ptr);
printf("Value at the new location: %d\n", *ptr);

return 0;
}

Output:

Initial address: 0x7ffeedf020
After incrementing: 0x7ffeedf024
Value at the new location: 20
After decrementing by 2: 0x7ffeedf01c
Value at the new location: 10

In this example:

  1. We declare an integer array arr with five elements and a pointer ptr pointing to the first element of the array.
  2. We use the printf function to display the memory address of the pointer ptr before and after performing arithmetic operations.
  3. Initially, ptr points to the first element of the array (10).
  4. We increment ptr by 1, effectively moving it to the next element in the array (20).
  5. We access and print the value at the new location, which is 20.
  6. We then subtract 2 from the pointer, which moves it back two elements in the array to the first element (10).

Pointer arithmetic is a powerful feature in C and is often used when iterating through arrays, working with dynamic memory allocation, or manipulating memory addresses efficiently. It's essential to be cautious with pointer arithmetic to ensure that you stay within the bounds of allocated memory to avoid undefined behavior.

Previous
Next