Data-types.md

-asd
\ No newline at end of file
+WData format supports three data types:
+- real
+- complex
+- vectors
+
+Each of which can be saved with single (float in C notation) or double (double in C notation) precision. See [example-write.c](https://gitlab.fizyka.pw.edu.pl/wtools/wdata/-/blob/master/c-examples/example-write.c) how one can create a variable:
+```c
+    wdata_variable vdensity_a = {"density_a", "real8", "none", "wdat"};
+```
+Here, `real8` denotes the double-precision (default), if one wants to save a space and store variables in single-precision one should change it to `real4`.
+
+If there is a complex number one wants to store then in order to add:
+```c
+    wdata_variable vdelta = {"delta", "complex8", "none", "wdat"};
+```
+here, `complex8` denotes the double-precision (default).
\ No newline at end of file