#include <stdio.h> 

int peoplenumber(n)

{

    int age;

    if(n==1)

        age==10;

    else

        age==peoplenumber(n-1)+2;

    return age;

}

int main() 

{

    int fifthage = peoplenumber(5);

printf("第5个人的年龄是%d岁", fifthage); 

return 0;

}