#include <stdio.h>
int learing()
{
    printf("%s\n","小明在慕课网学习");
    return 0;
}
int number(int a)
{
    printf("小明在慕课网上学习了%d门课程", a);
    return 0;
}
int main()
{
    int learing();
    int number(5);
    return 0;
}

In function 'main':
error: expected declaration specifiers or '...' before numeric constant
warning: no newline at end of file