foo.cc: In function 'int IsLeapYear(int)':
foo.cc:7:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(year%400==0||year%4==0&&year%100!=0)
                    ~~~~~~~~~^~~~~~~~~~~~~
foo.cc: In function 'int DaysOfMonth(int, int)':
foo.cc:35:7: error: 'IfLeapYear' was not declared in this scope
    if(IfLeapYear(year))
       ^~~~~~~~~~
foo.cc:35:7: note: suggested alternative: 'IsLeapYear'
    if(IfLeapYear(year))
       ^~~~~~~~~~
       IsLeapYear
foo.cc:40:4: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

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