关于#include 的试验（打代码新手），不知道这样行不行得通，如果这样不行那怎么改才 ok?

#include <stdio.h>
#define TARGET_AGE 88

int year1, year2;

int calcYear (int year1);

int main (void)
{
printf("What year was the subject born?");
printf("Enter as a 4-digit year (YYYY): ");
scanf(" %d", &year1);

year2= calcYear(year1);

printf("Someone born in %d will be %d in %d.",
year1, TARGET_AGE, year2);

system("pause");
return 0;
}

int calcYear(int year1)
{
return (year1 + TARGET_AGE);
}
把以上内容分为下面的两部分（以上的是书里的，下列的两部分由本人自己编辑）
/*test.c*/
#define TARGET_AGE 88

int year1;

int calcYear(int year1);

int main (void)
{
int calcYear(int year1);
{
return (year1 + TARGET_AGE);
}
}
和
/*include.c*/
#include <stdio.h>
#include <test.h>
#define TARGET_AGE 88

int year1, year2;

int calcYear(int year1);

int main (void)
{
printf ("What year was the subject born? ");
printf ("Enter as a 4-digit year (YYYY):");
scanf(" %d ", &year1);

year2 = calcYear(year1);

printf("Someone born in %d will be %d in %d.",
year1, TARGET_AGE, year2);
return 0;
}
如果我把 test.c 加入到 C 编译器的库函数里后（这个不知道行不，或者自己创建函数库？），再编辑 include.c 并编译，这样可以成功执行吗？