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Message: [QUOTE="arnuld, post: 4245670"] I am running into some issue of inclusion of header and I am unable to understand what is wrong: fileA.h #ifndef TEST_HEADERS_A #define TEST_HEADERS_A struct myStruct_A { int num; }; void use_print_values(void); #endif fileB.h #ifndef TEST_HEADERS_B #define TEST_HEADERS_B #include "fileA.h" void print_values(struct s1 s); #endif fileA.c #include <stdio.h> #include "fileA.h" #include "fileB.h" void use_print_values(void) { struct myStruct_A s; print_values(s); } fileB.c #include <stdio.h> #include "fileA.h" #include "fileB.h" void print_values(struct myStruct_A s) { printf("Num = %d\n", s.num); } ==================== OUTPUT ====================== [arnuld@dune C]$ gcc -ansi -pedantic -Wall -Wextra -c fileA.c In file included from fileA.c:3: fileB.h:6: warning: â€˜struct s1â€™ declared inside parameter list fileB.h:6: warning: its scope is only this definition or declaration, which is probably not what you want fileA.c: In function â€˜use_print_valuesâ€™: fileA.c:8: error: type of formal parameter 1 is incomplete [arnuld@dune C]$ [arnuld@dune C]$ gcc -ansi -pedantic -Wall -Wextra -c fileB.c In file included from fileB.c:3: fileB.h:6: warning: â€˜struct s1â€™ declared inside parameter list fileB.h:6: warning: its scope is only this definition or declaration, which is probably not what you want fileB.c:6: error: conflicting types for â€˜print_valuesâ€™ fileB.h:6: error: previous declaration of â€˜print_valuesâ€™ was here [arnuld@dune C]$ [/QUOTE]

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