C语言函数出错？函数好难学啊

Question

#include
main()
{
int aaaaa(int a)
{
int bbb;
bbb=1+a;
return bbb;
};
aaaaa = 1;
printf("%d",aaaaa);
}

Answer 1

 #include<stdio.h>
int aaaaa(int a)
{
int bbb;
bbb=1+a;
return bbb;
}
int main()
{
printf("%d",aaaaa(1));
}