[Dev-C++] Program causes error

[Scone S. <sc...@ho...>]

The program below causes an error on my computer, but I don't know what it 
could be.
Does anyone know?

Thanks, Scone

============================

#include <iostream>
#include <stdlib.h>

int main ()
{
   cout << "This program reads a number and calculates all rows of two or 
more\n";
   cout << "successive numbers of which the sum equals this number.\n";
   cout << "E.g.: 15 = 1+2+3+4+5 = 4+5+6 = 7+8\n\n";
   unsigned s, t, u, x, y, z;
   cout << "Type a random number and press enter: ";
   cin >> s;
   cout << endl;
   unsigned a[(s/2)+1];
   for(x=1;x++;x<=((s/2)+1))
   { y=1;
     for(u=1;u++;u<=((s/2)+1))
     { a[u]=0;
     }
     u=x;
     while(1)
     { a[y++]=u++;
       t=0;
       for(z=1;z++;z<=y)
       { t+=a[z];
       }
       if (t<=s) break;
     }
     cout << s << " = ";
     for(u=1;u++;u<=((s/2)+1))
     { cout << a[u] << " + ";
     }
     cout << endl;
   }

   system("pause");
   return 0;
}
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