## Cheap C Programming Assignment Help

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## Reason for Writing Linux Kernel in C

## Dynamic Memory Allocation

## String Operators in C

- strlen(example) for finding out the length of a string(example).
- strcpy(destination_example, source_example) for copying a string’s(source_example) contents to another one (destination_example).
- strcat(first_example, second_example) for jointing/appending a string (second_example)to the end of another one (first_example).
- strcmp(first_example, second_example) for comparing two string (first_example and second_example).
- strrev(example) for reversing a string (example).
- strlwr(example) for converting a string of characters (example) in lowercase.
- strupr(example) for converting a string of characters(example) in uppercase.

## C Programing to Declare Memory for an Integer Variable Dynamically

Dynamic memory allocation assigns free-store blocks of memory to the programs at run-time. In this memory allocation technique, the compiler does not need information about the exact amount of required memory for data storage. To dynamic memory allocation for integer variables in the C programming language, programmers must perform the following steps:

1. Declare an integer pointer, which involves the dynamically-allocated memory address.

Example: int *Integer_Variable

2. Allocate memory or blocks of memory at run-time for an integer variable using malloc()function predefined install.h header.

Example: Integer_Variable=(int*)malloc(sizeof(int))

In this statement, the malloc() function reserves the size of(int) bytes memory and allocates reserved memory address to the Integer_Variable.

## Recursion in C Programming Language

Recursion is a programming mechanism, defined as a procedure whose function (recursive function) calls a copy of itself(recursive call) directly/indirectly to solve a smaller problem. Indeed, recursion consists of several recursive calls that its exit condition has been determined (otherwise, the function will go into an infinite loop). Although recursive functions are shorter than iterative ones, they are hard to understand and only applied for the problems, divided into smaller sub-problems, including searching, calculating the factorial of a number, traveling, generating Fibonacci series, and sorting.

Recursion is supported by C/C++ programming language, i.e., a function could call a copy of itself inside the same function. The general process of recursion is illustrated in Algorithm 1.

Algorithm 1. The general process of recursion in C/C++

void recursive_function()

{

recursive_function(); //recursive_function calls itself

}

int main()

{

recursive_function();

}

## C Programming for solving Polynomial and Differential Equations

A polynomial equation is defined as an(xn), where, x and n are coefficients, variable, and exponent (a positive integer).For example, f(x)=4x2+x+7 is a polynomial equation. To solve this equation, the user should enter the value of x (x=3).The answer will be f(x)=46 by putting 3 in f(x)=4(3)2+3+7.Polynomial equations are common issues that programmers face when they are beginning to learn C language programming. To solve such problems in C, programmers should:

- Define some variables to save the user’s input (x), the order of the polynomial, coefficients (n), and output (f(x))
- Take input(x) and coefficients (n) from the user
- Calculate the output(f(x))
- Print the output

The differential is another group of mathematical equations, which relates a function and its derivatives.To calculate the derivative value off(x)=4x2+x+7 using the input of x (x=3),the first step is calculate the derivative of the equation (df(x)=8x+1). The answer will be df(x)=25 by putting 3 in f(x)=8(3)+1.To address such problems in C, programmers should follow the process similar to solve the polynomial equations:

- Define the Variables to save the user’s input (x), the order of the polynomial, coefficients (n), and output (df(x))
- Take input (x) and coefficients (n) from the user
- Calculate the output(df(x))
- Print the output