View Compilation Error

0_0_20932439_29432.cpp:4:22: error: stray '@' in program
 if((y%4==0&&y0!=0)||y@0==0)
                      ^
0_0_20932439_29432.cpp: In function 'int fun(int)':
0_0_20932439_29432.cpp:4:13: error: 'y0' was not declared in this scope
 if((y%4==0&&y0!=0)||y@0==0)
             ^
0_0_20932439_29432.cpp:4:23: error: expected ')' before numeric constant
 if((y%4==0&&y0!=0)||y@0==0)
                       ^
0_0_20932439_29432.cpp: In function 'int main()':
0_0_20932439_29432.cpp:14:12: error: expected primary-expression before '?' token
 if(month>8)?
            ^
0_0_20932439_29432.cpp:15:36: error: expected ':' before ';' token
 sum+=(30*(month-1)+(month+1)/2+day);
                                    ^
0_0_20932439_29432.cpp:15:36: error: expected primary-expression before ';' token