SAP ABAP Planning Sy-repid and Sy-cprog differences

First of all.  It's two explanations for the sy-repid is the name of the current program. "Program name for the current program
Sy-cprog is the name of the calling program. " program name of the calling program

Write a simple program, tune an FM, you know the difference, when the program enters the FM

Sy-repid is the name of the FM Functionpool,
Sy-cprog is the program name of the report calling this FM.

In addition,SY-repid You cannot change, Sy-cprog like other data structures can be changed.

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SAP ABAP Planning Sy-repid and Sy-cprog differences