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+/****************************************************************************
+ * DESCRIPTION:  
+ *   Serial HEAT2D Example - C Version
+ *   This example is based on a simplified 
+ *   two-dimensional heat equation domain decomposition.  The initial 
+ *   temperature is computed to be high in the middle of the domain and 
+ *   zero at the boundaries.  The boundaries are held at zero throughout 
+ *   the simulation.  During the time-stepping, an array containing two 
+ *   domains is used; these domains alternate between old data and new data.
+ *
+ *  The physical region, and the boundary conditions, are suggested
+    by this diagram;
+
+                   u = 0
+             +------------------+
+             |                  |
+    u = 100  |                  | u = 100
+             |                  |
+             +------------------+
+                   u = 100
+
+Interrior point :
+  u[Central] = (1/4) * ( u[North] + u[South] + u[East] + u[West] )
+
+ ****************************************************************************/
+
+Available version:
+1-Serial
+2-Parallel OpenMP
+3-Parallel MPI
+ 
+