#includestdio.hvoidmain(){intyear,month,day;printf(\"请输入年月\");scanf(\"%f%,year);switch(month){case(1):;case(3):;case(5):;case(7):;case(8):;case(10):;case(12):;printf(\"day=%f\",31);break;case(2):;if(year%4==0elseprintf(\"day=%f\",28);break;case(4):;case(6):;case(9):;case(11):;printf(\"day=%f\",30);break;}}
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