The key to technical interviews
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The document provides guidance on integer type selection in C. It recommends using long for large values over 32,767, short if space is very important, and int otherwise. It also recommends unsigned types if overflow characteristics or negative values are not important. Character types can cause issues when used as integers. Long long is specified in C99 for 64-bit integers. Typedefs like int16 and int32 can define exact sizes but may not match all machines and cannot address byte order issues.
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This power point explains about some interesting interview technical questions from C programming. All the programs are explained with detailed necessary information.
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There are few important operations, which we will do with the help of pointers very frequently. (a) we define a pointer variable (b) assign the address of a variable to a pointer and (c) finally access the value at the address available in the pointer variable. This is done by using unary operator * that returns the value of the variable located at the address specified by its operand.
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The document provides guidance on integer type selection in C. It recommends using long for large values over 32,767, short if space is very important, and int otherwise. It also recommends unsigned types if overflow characteristics or negative values are not important. Character types can cause issues when used as integers. Long long is specified in C99 for 64-bit integers. Typedefs like int16 and int32 can define exact sizes but may not match all machines and cannot address byte order issues.
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Let's turn the table. Suppose your goal is to deliberately create buggy programs in C and C++ with serious security vulnerabilities that can be "easily" exploited. Then you need to know about things like stack smashing, shellcode, arc injection, return-oriented programming. You also need to know about annoying protection mechanisms such as address space layout randomization, stack canaries, data execution prevention, and more. These slides will teach you the basics of how to deliberately write insecure programs in C and C++.
A PDF version of the slides can be downloaded from my homepage: http://olvemaudal.com/talks
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Pointers are variables that contain memory addresses as values. A pointer indirectly references a value stored at a memory location, while a regular variable directly references the value. Pointers can be used to pass addresses of variables to functions to allow the functions to modify the original variables, known as call by reference. Arithmetic and logical operations can be performed on pointers, such as incrementing, decrementing, and comparing pointers.
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A pointer is a variable whose value is the address of another variable, i.e., direct address of the memory location. Like any variable or constant, you must declare a pointer before you can use it to store any variable address.
There are few important operations, which we will do with the help of pointers very frequently. (a) we define a pointer variable (b) assign the address of a variable to a pointer and (c) finally access the value at the address available in the pointer variable. This is done by using unary operator * that returns the value of the variable located at the address specified by its operand.
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In computer science, a pointer is a programming language object, whose value refers to (or "points to") another value stored elsewhere in the computer memory using its memory address. A pointer references a location in memory, and obtaining the value stored at that location is known as dereferencing the pointer.
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Here are the values of c in each case:
1. int a = 10, b = 2;
c = 12, 8, 20, 5
2. float a = 10, b = 2;
c = 12, 8, 20, 5
3. int a = 10; float b = 2;
c = 12, 8, 20, 5
The data types of the operands determine the result. For integer operands, the result is an integer. For floating point operands, the result is floating point.
C Pointers
Pointers in C allow variables to hold the memory addresses of other variables and data types. Pointers use the asterisk (*) and ampersand (&) operators - * accesses the value at a memory address, while & returns the memory address of a variable. Pointers are useful for passing arguments to functions, returning multiple values from functions, and accessing arrays through a single pointer variable. Pointer arithmetic increments or decrements a pointer by the size of its data type. Pointer-to-pointers allow pointers to hold the addresses of other pointer variables. Proper initialization and boundary checking is important to avoid crashes with pointers.
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The document discusses pointers in C programming. It defines pointers as variables that store memory addresses and can be used to indirectly access the value of another variable. It explains pointer declaration syntax and how to assign values and memory addresses to pointers. It provides examples of pointer arithmetic and how pointers can be used to modify variable values.
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This document contains 10 questions and answers about various C language concepts:
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2. A static variable in C is declared inside a function but its value is retained between function calls.
3. A normal variable stores a value that can change, while a pointer defines the address of another variable rather than storing a value itself.
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This C tutorial covers every topic in C with the programming exercises. This is the most extensive tutorial on C you will get your hands on. I hope you will love the presentation. All the best. Happy learning.
Feedbacks are most welcome. Send your feedbacks to dwivedi.2512@gmail.com. You can download this document in PDF format from the link, http://www.slideshare.net/dwivedi2512/learning-c-an-extensive-guide-to-learn-the-c-language
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Here are the values of c in each case:
1. int a = 10, b = 2;
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c = 12, 8, 20, 5
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The data types of the operands determine the result. For integer operands, the result is an integer. For floating point operands, the result is floating point.
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This document contains 10 questions and answers about various C language concepts:
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The document provides an overview of the C programming language. It discusses that C was developed at Bell Labs in the 1970s and is a general purpose language closely associated with UNIX. It then covers C's character set, keywords, basic program structure including header files and library functions, data types, variables, constants, and provides a simple "Hello World" example program.
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The document provides an introduction to the C programming language, outlining its key characteristics, structure, data types, control structures like if/else and switch statements, looping, arrays, pointers, structures, and functions. It describes C as a structured, low-level language developed in 1969-1973, and covers basic data types like int, char, and float, as well as derived types like arrays and pointers.
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This C tutorial covers every topic in C with the programming exercises. This is the most extensive tutorial on C you will get your hands on. I hope you will love the presentation. All the best. Happy learning.
Feedbacks are most welcome. Send your feedbacks to dwivedi.2512@gmail.com. You can download this document in PDF format from the link, http://www.slideshare.net/dwivedi2512/learning-c-an-extensive-guide-to-learn-the-c-language
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