From 917b3765c4f20be657dab4d71fea8389e8be4a64 Mon Sep 17 00:00:00 2001
From: baol <j2eer@163.com>
Date: Mon, 13 May 2024 14:04:30 +0800
Subject: [PATCH] first commit

---
 .projectile         |   0
 READMe.md           |   6 ++++++
 bad                 | Bin 0 -> 15968 bytes
 build/c_hello       | Bin 0 -> 15960 bytes
 build/hello         | Bin 0 -> 16208 bytes
 example2.c          |   6 ++++++
 example3/Makefile   |   7 +++++++
 example3/hello.h    |   1 +
 example3/hello_fn.c |   6 ++++++
 example3/hello_fn.o | Bin 0 -> 1520 bytes
 example3/main       | Bin 0 -> 16024 bytes
 example3/main.c     |   6 ++++++
 example3/main.o     | Bin 0 -> 1504 bytes
 example4/main       | Bin 0 -> 16000 bytes
 example4/main.c     |   9 +++++++++
 example5/a.out      | Bin 0 -> 16000 bytes
 example5/dtest.c    |  10 ++++++++++
 example6/.#hello.cc |   1 +
 example6/a.out      | Bin 0 -> 16376 bytes
 example6/hello      | Bin 0 -> 16376 bytes
 example6/hello.cc   |   6 ++++++
 example6/hello.o    | Bin 0 -> 2552 bytes
 hello.F90           |   5 +++++
 hello.c             |   6 ++++++
 24 files changed, 69 insertions(+)
 create mode 100644 .projectile
 create mode 100644 READMe.md
 create mode 100755 bad
 create mode 100755 build/c_hello
 create mode 100755 build/hello
 create mode 100644 example2.c
 create mode 100644 example3/Makefile
 create mode 100644 example3/hello.h
 create mode 100644 example3/hello_fn.c
 create mode 100644 example3/hello_fn.o
 create mode 100755 example3/main
 create mode 100644 example3/main.c
 create mode 100644 example3/main.o
 create mode 100755 example4/main
 create mode 100644 example4/main.c
 create mode 100755 example5/a.out
 create mode 100644 example5/dtest.c
 create mode 120000 example6/.#hello.cc
 create mode 100755 example6/a.out
 create mode 100755 example6/hello
 create mode 100644 example6/hello.cc
 create mode 100644 example6/hello.o
 create mode 100644 hello.F90
 create mode 100644 hello.c

diff --git a/.projectile b/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/READMe.md b/READMe.md
new file mode 100644
index 0000000..6545ac8
--- /dev/null
+++ b/READMe.md
@@ -0,0 +1,6 @@
+## call fortran routine from C++ function
+
+* a FORTRAN90 subroutine is like a C++ void function, and should be declared this way in the C++ code. The qualifier extern should also be used.
+* a FORTRAN90 subroutine or function expects all its arguments to be passed by reference. This generally means simply that the C++ function must pass scalar variables by reference, not value.
+* typically, when the FORTRAN90 compiler compiles the FORTRAN90 code, the names of functions and subroutines are stored with an appended underscore. In order for these names to be found by the C++ code, it is necessary that the C++ code declare and invoke the FORTRAN90 functions and subroutines with the underscore explicitly appended to the name.
+* in many cases, a FORTRAN90 compiler is simply a "front end" to a corresponding C++ compiler, as in the case of the GNU compilers gfortran and g++, or the Intel compilers ifort and icpp. This means that, as long as the corresponding compilers are used to compile the FORTRAN90 and C++ codes, it is probably possible to use either compiler to link and load the object codes; however, the load command may need to specify explicitly certain libraries associated with one of the languages. For instance, if loading using the gcc command, it is necessary to include "-l gfortran" so that the FORTRAN90 I/O libraries, among others, are included in the build.
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diff --git a/example2.c b/example2.c
new file mode 100644
index 0000000..1af1efb
--- /dev/null
+++ b/example2.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main (void) {
+    printf("Two plus two is %f\n", 4);
+    return 0;
+}
diff --git a/example3/Makefile b/example3/Makefile
new file mode 100644
index 0000000..d401832
--- /dev/null
+++ b/example3/Makefile
@@ -0,0 +1,7 @@
+CC=gcc
+CFLAGS=-Wall
+
+main: main.o hello_fn.o
+
+clean:
+	rm -f main main.o hello_fn.o
diff --git a/example3/hello.h b/example3/hello.h
new file mode 100644
index 0000000..6f27270
--- /dev/null
+++ b/example3/hello.h
@@ -0,0 +1 @@
+void hello(const char* name);
diff --git a/example3/hello_fn.c b/example3/hello_fn.c
new file mode 100644
index 0000000..a0983d4
--- /dev/null
+++ b/example3/hello_fn.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+#include "hello.h"
+
+void hello(const char* name) {
+    printf("Hello, %s!\n", name);
+}
diff --git a/example3/hello_fn.o b/example3/hello_fn.o
new file mode 100644
index 0000000000000000000000000000000000000000..6f6cc0a73fc7424314eb58d5db86bef5e583a506
GIT binary patch
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literal 0
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diff --git a/example3/main b/example3/main
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literal 0
HcmV?d00001

diff --git a/example3/main.c b/example3/main.c
new file mode 100644
index 0000000..4220484
--- /dev/null
+++ b/example3/main.c
@@ -0,0 +1,6 @@
+#include "hello.h"
+
+int main(void) {
+    hello("world, everyone");
+    return 0;
+}
diff --git a/example3/main.o b/example3/main.o
new file mode 100644
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literal 0
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diff --git a/example4/main b/example4/main
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GIT binary patch
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diff --git a/example4/main.c b/example4/main.c
new file mode 100644
index 0000000..6f6c765
--- /dev/null
+++ b/example4/main.c
@@ -0,0 +1,9 @@
+#include <math.h>
+#include <stdio.h>
+
+int main(void) {
+    double x = 2.0;
+    double y = sqrt(x);
+    printf("the square root of %f is %f \n", x, y);
+    return 0;
+}
diff --git a/example5/a.out b/example5/a.out
new file mode 100755
index 0000000000000000000000000000000000000000..2b43e1ec2398527b490ab38447c7728aece287bf
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/example5/dtest.c b/example5/dtest.c
new file mode 100644
index 0000000..05547b6
--- /dev/null
+++ b/example5/dtest.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+int main(void) {
+#ifdef TEST
+    printf("TEST mode\n");
+#endif
+    printf("Running...\n");
+    printf("value of NUM is %d\n", NUM);
+    return 0;
+}
diff --git a/example6/.#hello.cc b/example6/.#hello.cc
new file mode 120000
index 0000000..d372cae
--- /dev/null
+++ b/example6/.#hello.cc
@@ -0,0 +1 @@
+shudws@shudws.5723:1715510568
\ No newline at end of file
diff --git a/example6/a.out b/example6/a.out
new file mode 100755
index 0000000000000000000000000000000000000000..7c017ea0f4efdf9691026beaafcba6534d77778f
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/example6/hello b/example6/hello
new file mode 100755
index 0000000000000000000000000000000000000000..7c017ea0f4efdf9691026beaafcba6534d77778f
GIT binary patch
literal 16376
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literal 0
HcmV?d00001

diff --git a/example6/hello.cc b/example6/hello.cc
new file mode 100644
index 0000000..1fff3d8
--- /dev/null
+++ b/example6/hello.cc
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    std::cout << "Hello, world\n";
+    return 0;
+}
diff --git a/example6/hello.o b/example6/hello.o
new file mode 100644
index 0000000000000000000000000000000000000000..f7ae8a6b112cec1bf4f53603d5f9bd9a6c47cbef
GIT binary patch
literal 2552
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v?G4IJv;QYX;~RtP^6@sh-<}|`Xh8Q5+@wQDE|1b&#NROWe`exXx%__tlIKI+

literal 0
HcmV?d00001

diff --git a/hello.F90 b/hello.F90
new file mode 100644
index 0000000..5827201
--- /dev/null
+++ b/hello.F90
@@ -0,0 +1,5 @@
+program hello
+  ! this is comment line
+
+  print *, "hello world!"
+end program hello
diff --git a/hello.c b/hello.c
new file mode 100644
index 0000000..f8317f2
--- /dev/null
+++ b/hello.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main (void) {
+    printf("Hello, world!\n");
+    return 0;
+}