03.9.md

eBook/examples/chapter_3/CandGo/Makefile

@@ -0,0 +1,7 @@
+include $(GOROOT)/src/Make.inc
+
+TARG=rand
+CGOFILES=\
+   c1.go\
+
+include $(GOROOT)/src/Make.pkg

eBook/examples/chapter_3/CandGo/c1.go

@@ -0,0 +1,13 @@
+// c1.go
+package rand
+
+// #include <stdlib.h>
+import "C"
+
+func Random() int {
+   return int(C.random())
+}
+
+func Seed(i int) {
+   C.srandom(C.uint(i))
+}

eBook/examples/chapter_3/CandGo/c2.go

@@ -0,0 +1,13 @@
+// c2.go
+package print
+
+// #include <stdio.h>
+// #include <stdlib.h>
+import "C"
+import "unsafe"
+
+func Print(s string) {
+   cs := C.CString(s)
+   defer C.free(unsafe.Pointer(cs))
+   C.fputs(cs, (*C.FILE)(C.stdout))
+}