way simpalar

new.cpp

#include <fstream>
#include <math.h>
using namespace std;

int main(void) {
	ofstream fp5;
    fp5.open ("Laplace101.txt");
	
	double V[11];
	double diff(1.0);
	double oldv;
	int j = 0;
	int i;
	V[1]=0;
	V[2]=7;
	V[3]=25;
	V[4]=32;
	V[5]=39;
	V[6]=42;
	V[7]=55;
	V[8]=70;
	V[9]=82;
	V[10]=93;
	V[11]=100;
	
	while (diff >= .001) 
	{
	oldv = V[9];
	for (i=2; i<=10; i++)
		{
		V[i]=.5*(V[i+1]+V[i-1]);
		}
	diff = fabs(V[9]-oldv)/oldv;
	j++;
	}
	for(int k=1; k<=11; k++) {
		fp5 << k << " " << V[k] << endl;
		}
fp5.close();
return 0;
}