foo.cc: In function 'int main()':
foo.cc:8:56: error: assignment of read-only location 'daynum[2]'
     if((year%4==0&&year%100!=0)||year%400==0)daynum[2]=29;
                                                        ^~
foo.cc:9:20: error: assignment of read-only location 'daynum[2]'
     else daynum[2]=28;
                    ^~

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