12082011, 07:38 AM  #1 (permalink) 
Status: Junior Member
Posts: 7

whats wrong with this program, please help?
Problem: Numerically solve the following differential equations using the Euler method
du/dt = v dv/dt = kv  u³ + B cos(t) with k=0.1, B = 11.0, and plot the result using gnuplot. Change the parameters to k=0.4, B =20.0 and show the graph as well. You can use the initial condition as u(0)=1, v(0)=1. Also use h=0.01, i=10000. Program: #include <stdio.h> #include <math.h> double f(double t, double y) { return y; } int main() { double h=0.1, y, t, B, k, x; int i; t=0.0; y=1.0; k=0.1; B=11.0; for (i=0; i<=10000; i++) } printf("t=%lf %lf %lf\n", t, y, k*y  x*x*x + B*cos(t)); y=y+h*f(t,y); t=t+h; } return 0; } please help I have to plot and everytime I try an error occurs so I'm pretty sure there is an error in the program. I'm a beginner at programming and I'm also not too familiar with Euler's Method...any help is appreciated thanks. 
12082011, 07:38 AM  #2 (permalink) 
Status: Junior Member
Posts: 1

whats wrong with this program, please help?
I just had a quick look,for every open bracket there should be a corresponding closed bracket (please check this)
Also where should the main() occur,is it occuring at wrong place?.Also check for other syntax like ;after B=11.0 etc is it correct ? I need more time to study this to find out other errors. 
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