Add struct for the data

src/main.cpp

@@ -3,9 +3,15 @@
 #include <iostream>
 #include <omp.h>
 
+typedef struct data {
+    double E = 0.;
+    double E_squared = 0.;
+    double M = 0.;
+    double M_squared = 0.;
+    double M_abs = 0.;
+} data_t;
+
 int main()
 {
-    IsingModel test(5, 1.);
-
     return 0;
 }