输入年月日实现计算这是一年的第几天

#include<stdio.h>
/*通过输入年月日，计算这一天是这一年的第几天，* 支持任意输入，不正确输入均有提示*/
int main()
{int year,month,day,Hday,monthD; //Hday--定义总共经过了几天，monthD--month-1的天数累加和printf("please input year,month and day:");scanf("%d%d%d",&year,&month,&day);monthD =0;if(month ==1 && day<1||day>31){printf("There was no such day this year\n");}else{switch(month-1){  default: printf("you input err!\n");break;case 11: {if(month==12&&day>31||day<1){printf("There was no such day this year\n");break;}    else{monthD = monthD+30;}};       case 10: {if(month==11&&day>30||day<1){printf("There was no such day this year\n");break;}    else{monthD = monthD+31;}};case 9:  {if(month==10&&day>31||day<1){printf("There was no such day this year\n");break;}   else{monthD = monthD+30;}};case 8:  {if(month==9&&day>30||day<1){printf("There was no such day this year\n");break;}    else{monthD = monthD+31;}};case 7:  {if(month==8&&day>31||day<1){printf("There was no such day this year\n");break;}    else{monthD = monthD+31;}};case 6:  {if(month==7&&day>31||day<1){printf("There was no such day this year\n");break;}    else{monthD = monthD+30;}};case 5:  {if(month==6&&day>30||day<1){printf("There was no such day this year\n");break;}    else{monthD = monthD+31;}};case 4:  {if(month==5&&day>31||day<1){printf("There was no such day this year\n");break;}    else{monthD = monthD+30;}};case 3:  {if(month==4&&day>30||day<1){printf("There was no such day this year\n");break;}    else{monthD = monthD+31;}};case 2:  {if(month==3&&day>31||day<1){printf("There was no such day this year\n");break;}    else{if(year%4==0 && year%100!=0|| year%400==0){monthD = monthD+29;}else{                    monthD = monthD+28;}}};case 1: {if(year%4==0 && year%100!=0|| year%400==0){if(month==2&&day>29||day<1){printf("There was no such day this year\n");break;}else{monthD = monthD+31;}}else{                    if(month==2&&day>28||day<1){printf("There was no such day this year\n");break;}else{monthD = monthD+31;}}};case 0:{if(month==1&&day>31||day<1){printf("There was no such day this yeari");break;}Hday =monthD + day;printf("%d年%d月%d日是这一年的第%d天\n",year,month,day,Hday);}}}return 0;
}

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输入年月日实现计算这是一年的第几天

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