would you please guide how to write this code?

[spring2014]

Hi,
I want to write a code that n times ask me a constant number (c) and solve the dx/dt=c by euler methods. would you please help me? I have written a code to solve the equation dy/dx=10*x by euler methods but I do not know how to change it for n times asking a constant.

  #include <iostream>
#include <cmath>
using namespace std;
#define dist 0.001               /* stepsize in t*/
#define MAX 1.0                /* max for t */
int N=1;
void euler(double x, double y[], double step); /* Euler function */

double f(double x, double y[], int i);          /* function for derivatives */

int main()
{
double t, y[N];
int j;

y[0]=0;                                       /* initial condition */


for (j=0; j*dist<=MAX ;j++)                     /* time loop */
{
   t=j*dist;
   cout<<"j="<<j<<"\t"<<"t="<<t<<"\t"<<"y[t]="<< y[0]<<"\n";
   euler(t, y, dist);

}

}

void euler(double x, double y[], double step)
{
double  s[N];      /* for euler */
int i;
{
for (i=0;i<N;i++)
 {     s[i]=step*f(x, y, i);
}
}

{
for (i=0;i<N;i++)
     y[i]+=s[i];
}
}
double  f(double x, double y[], int i)
{
      return(10*x);                 /* derivative of first equation */
}