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//cExample.h
#ifndef C_EXAMPLE_H
#define C_EXAMPLE_H
#ifdef __cplusplus
extern "C"
{
#endif
int add(int x, int y);
#ifdef __cplusplus
}
#endif
#endif
---------------------------------
//cExample.c
#include"cExample.h"
int add(int x, int y)
{
 return x + y;
}
---------------------------------
//cppFile.cpp
#include <iostream>
#include"cExample.h"
using namespace std;
main()
{
    cout<<add(2,3)<<endl;
    return 0;
}
--------------------------------
//makefile
cppFile: cppFile.o cExample.o
    g++ -g -o cppFile cppFile.o cExample.o
cppFile.o: cppFile.cpp
    g++ -g -c cppFile.cpp
cExample.o: cExample.c cExample.h
    gcc -g -c cExample.c
clean:
    rm -f *.o cppFile


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#include <iostream>
using namespace
std;

extern "C" { int g_inta; }

int main (void)
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int func(x)
{
int countx = 0;
while(x)
{
countx
++;
x = x&(x-1);
}
return countx;
}
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