C programming of Runge-Kutta method?
/* Runge Kutta for a set of first order differential equations */
#define N 2 /* number of first order equations */
#define dist 0.1 /* stepsize in t*/
#define MAX 30.0 /* max for t */
FILE *output; /* internal filename */
void runge4(double x, double y, double step); /* Runge-Kutta function */
double f(double x, double y, int i); /* function for derivatives */
double t, y[N];
output=fopen("osc.dat", "w"); /* external filename */
y=1.0; /* initial position */
y=0.0; /* initial velocity */
fprintf(output, "0\t%f\n", y);
for (j=1; j*dist<=MAX ;j++) /* time loop */
runge4(t, y, dist);
fprintf(output, "%f\t%f\n", t, y);
void runge4(double x, double y, double step)
double h=step/2.0, /* the midpoint */
t1[N], t2[N], t3[N], /* temporary storage arrays */
k1[N], k2[N], k3[N],k4[N]; /* for Runge-Kutta */
t2[i]=y[i]+0.5*(k2[i]=step*f(x+h, t1, i));
t3[i]=y[i]+ (k3[i]=step*f(x+h, t2, i));
k4[i]= step*f(x+step, t3, i);
double f(double x, double y, int i)
x=y; /* derivative of first equation */
x= -0.2*y-y; /* derivative of second equation */
The symbol and (ampersand, &) in C and C++ programming is the bitwise inclusive or operator. If there are two ampersands (&&) it is a relational inclusive or operator. As a unary operator, it means to take the address of something. In C++, it can also be overridden in a class method to mean nearly anything else.
C and C++ programming is good for embedded programming. However, embedded implies long running, and that means the possibility of memory fragmentation. You will need to spend time working out or acquiring a method of memory management, such as the use of Smart Pointers and Garbage Collection. This is not a trivial task, but it is a necessary task.
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I am guessing you typed the question wrong, the way I understand your question is "Why is the programming language named C++ and not C ? " The answer to this is that there is a programming language called C, and in that programming language the ++ means increment by one. So C++ is the language C improved, as such it can read and compile all C programs in addition to having other features that…
The C# sharp programming language is a relatively young programming language created by Microsoft. It is heavily influenced by another (and older) programming language called C++, which in itself is often regarded as a succesor to the programming language C. As far to my knowledge C# is only used in order to develop .NET based applications.
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