C C + + calls issues with each other

1. C + + calls the C. language function

C Language Header file C_header.h

#ifndef __c_header_h_#define __c_header_h_#ifdef __cplusplusextern "C" {#endifint c_add (int a, int b); void C_print_data ( int x); #ifdef __cplusplus} #endif #endif

C Language Implementation file c_realize.c

#include <stdio.h> #include "c_header.h" int c_add (int a, int b) {return a+b;} void C_print_data (int x) {printf ("int c_print_data, X is:%d\n", x);}

C + + Test file Cpp_test.cpp

#include <iostream> #include "c_header.h" using namespace Std;void main () {int A=23;int b=32;c_add (A, b); C_print_ Data (a);}

2. C language calls C + + code

C + + header file Cpp_header.h

#ifndef _cpp_header_h_#define _cpp_header_h_int cpp_add (int a, int b); void cpp_print_data (int x); #endif

C + + implementation file Cpp_realize.cpp

#include <iostream> #include "c_header.h" using namespace std; #ifdef __cplusplusextern "C" {#endifint cpp_add (int a , int b) {return a+b;} void Cpp_print_data (int x) {cout<< "int the Cpp_print_data, X is:" <<X<<ENDL;} #ifdef __cplusplus} #endif

C Language test file c_test.c

#include <stdio.h> #include "cpp_header.h" void Main () {int a=4;int b=23;printf ("result is:%d\n", Cpp_add (A, b)); Cpp_print_data (a);}

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C C + + calls issues with each other