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//////// add.c
int add(int a, int b)
{
     return a + b;
}
///////// main.c
#include <stdio.h>
int add(int a, int b);
int main ()
{
      printf("%d", add(1, 2));
      return 0;
}
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/*
 ============================================================================
 Name        : test.c
 Author      : alf
 Version     :
 Copyright   : Your copyright notice
  ......
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