C Programming

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Why in C language is it the case that a[5] == 5[a]?

The C standard defines the Array Subscript Operator [] as follows: a[b] == *(a + b) Therefore a[5] will evaluate to: *(a + 5) and 5[a] will evaluate to:

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Why isn't sizeof for a struct equal to the sum of sizeof of each member?

This is because of padding added to satisfy alignment constraints. Data structure alignment impacts both performance and correctness of programs. Here's an example using typical settings

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Why is one loop so much slower than two loops?

Suppose a1, b1, c1, and d1 point to heap memory and code has the following loop. const int n=100000; for(int j=0;j<n;j+

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Why is processing a sorted array faster than an unsorted array?

Here is a piece of Visual C++ code that seems very peculiar. For some strange reason, sorting the data miraculously makes the code almost six times faster. #include

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What is the difference between #include <filename> and #include “filename”?

The difference is in the location where the preprocessor searches for the included file. For #include "filename" the preprocessor searches in the same directory as the

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What are the differences between a pointer variable and a reference variable?

* A pointer can be re-assigned: int x = 5; int y = 6; int *p; p = &x; p = &y; *p = 10; assert(x == 5); assert(y == 10)

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What is the name of the "-->" operator?

Here's an example: #include <stdio.h> int main() { int x = 10; while( x --> 0 ) // x goes to 0 { printf("%d ", x)

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Quiz - Loops (for, while, do while, break, continue and goto) in C Programming

This quiz is based on this Loops in C tutorial including introduction to for loop, while loop, do while loop, break, continue statement, and goto. So, To get

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Turbo C++ IDE Shortcuts

S.No. Shortcuts keys Action 1 F1 For Help 2. F2 Save 3. F3 Open 4. F4 Go to cursor 5. F5 Zoom 6. F6 Next 7. F7

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Quiz - Decision Control, Expression and Operators in C

This quiz is based on the and Expression & Operators Precedence and The Decision Control Structure tutorial. So, To get better score on quiz, read the tutorial first.

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Quiz - Introduction to C Programming

This quiz is based on this Introduction to C Programming tutorial. So, To get better score on quiz, read the tutorial first. Poll Maker

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Download Turbo C++ for Windows 7, 8, 8.1, 10 and Windows 11 (32-64 bit) with full/window screen mode and many more extra features

1. How to install Turbo C++ Step 1 Download Turbo C++ for Windows 11 Download Turbo C++ for Windows 10 or older Step 2 If any previous version

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Command Line Arguments - C Programming

The arguments that we pass on to main() at the command prompt are called command line arguments. The full declaration of main looks like this: int main (int

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C Programming Language Cheat Sheet

1. C Programming 1.1 What is C? * C is a programming language developed at AT & T’s Bell Laboratories of USA in 1972 by Dennis Ritchie.

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Strings - C Programming

1. What is String? Strings are arrays of characters. Each member of array contains one of characters in the string. Example #include<stdio.h> main() { char