added substraction

CMakeLists.txt

@@ -48,8 +48,8 @@ endif()
 # set paths to 'explelibx-common' sources
 set(COMMON_SOURCE_DIR "${COMMON_DIR}/explelibx-common")
 set(COMMON_HEADER_DIR "${COMMON_DIR}/explelibx-common")
-set(COMMON_SOURCES exple-add.cpp)
-set(COMMON_HEADERS exple-add.h)
+set(COMMON_SOURCES exple-add.cpp exple-substract.cpp)
+set(COMMON_HEADERS exple-add.h exple-substract.h)
 list(TRANSFORM COMMON_SOURCES PREPEND "${COMMON_SOURCE_DIR}/")
 list(TRANSFORM COMMON_HEADERS PREPEND "${COMMON_HEADER_DIR}/")
 
@@ -93,3 +93,6 @@ source_group("Grid\\Sources" FILES "${GRID_SOURCES}")
 source_group("Grid\\Headers" FILES "${GRID_HEADERS}")
 source_group("CMake-Build\\Sources" FILES "${CURRENT_SOURCES}")
 source_group("CMake-Build\\Headers" FILES "${CURRENT_HEADERS}")
+
+message(STATUS "common header dir: ${COMMON_HEADER_DIR}")
+message(STATUS "header dir: ${HEADER_DIR}")

exple-cmake-build/exple-expr.hpp

 #include "exple-add.h"
 #include "exple-mul.h"
+#include "exple-substract.h"
 
 namespace exple
 {
   int add_and_mul( int a, int b, int c);
+    int add_and_sub( int a, int b, int c);
+
 }
 
 int exple::add_and_mul( int a, int b, int c)
 {
   return exple::mul(exple::add(a, b), c);
 }
+
+int exple::add_and_sub( int a, int b, int c)
+{
+    return exple::mul(exple::substract(a, b), c);
+}

exple-cmake-build/main.cpp

@@ -8,7 +8,8 @@ int main()
   int a = 2;
   int b = 3;
   int c = 4;
-  printf("Multiplication of sum of %i and %i by %i is... %i", a, b, c, exple::add_and_mul(2, 3, 4));
+  printf("Multiplication of sum of %i and %i by %i is... %i\n", a, b, c, exple::add_and_mul(2, 3, 4));
+    printf("Multiplication of substraction of %i and %i by %i is... %i\n", a, b, c, exple::add_and_sub(2, 3, 4));
 
   return 0;
 }