C Programs

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A brief description

hello.c

A simple "Hello World" program

sqroot.c

A program to read in a number and calculate the square root

for_loop.c

This program uses a for loop to read in data to an array, x, and then sum the numbers in the array

while_loop.c

This program uses a while loop to read in data to an array, x, and then sum the numbers in the array

function.c

This program is an example of how to use functions in C

pointer_values.c

A program to show the difference between a pointer and its dereferenced value.

swap.c

This program uses a function and pointers to swap the value of two variables in the calling environment.

strings.c

A short program that prints out parts of a string, accessed using a pointer.

sea.c

A program to explore strings, arrays and pointers

mysterycode.c

If you like a challange ....
You can compile and run this program as usual to see the output! Merry Christmas!

number_sum.c

This program demonstrates reading and writing data to files.

bisection.c

The bisection program from the 16.01.01 lecture.

newton-raphson.c

A program to implement the Newton-Raphson algorithm for a specific function, f(x).

Data tables

Tables of data comparing analytic, Euler and second order Runge-Kutta results for

y¢ = 1-2xy y(0) = 0

Euler.c

The Euler program. This program solves the ODE

= -y(t) , y(0) = 1

Try changing the step size and compare the results the analytic solution ... you should see something like this plot

Runge-Kutta.c

A program to use fourth order Runge-Kutta to solve the Harmonic oscillator (with friction). The plots corresponding to different 2b and w² are here.

Simpson.c

The C code to implement Simpson's Rule. The number of steps is taken to be 20.

mem_map.c

The program used for 1 last memory map example!

vectors_withfncs.c

Calculates the dot and cross product of 2 vectors in C functions

matrix_add.c

Program that adds two matrices in a function and returns the resulting matrix from the function

GaussElimination.c

Program that does gaussian elimination with partial pivoting and abck-substitution to solve a 3x3 matrix equation.

Employee1.c

Program using structures to store and manipulate information about employee(s) of a company. This is the first in a series of like programs to illustrate the use of structures.

Employee2.c

Version for many employees

Employee3.c

Version using pointers.

bubble.c

The bubble sort program. The array, a is initialised - you can change the values.

selectionsort.c

The selection sort program. Note the swap function is not called for each value of the index i but only once the largest number in the list has been found. We keep track of where this largest number is by saving its array index in current_max_index. Note the value of this largest number is never used.

merge.c

A program to merge two already sorted arrays

sortmerge.c

A program to sort a list using the merge technique. Extra comments about this code.

lotto.c

A program to generate 6 random numbers using the clock to seed the generator

Schol-04.Q2

Question 2 on Schol paper 2004, the three functions are given here.