iOS Introductory C language-basic function--3--judgment date is the day ordinal of a year

3. Judgment date is the day of the year

Parameter return value resolution:

Parameters:

Y:int, year;

M:int, Month

D:int, date

return value:

Sum: The day of the year in which the incoming date is;

Function parsing:

leapyear(y); Judge y is not a leap year, reference (2) leap year judgment; Link address: http://www.cnblogs.com/kongkaikai/p/4676161.html

1 intDnum (intYintMintd)2 3 {4 5     inti,sum;6 7     intdays[]={0, to, -, to, -, to, -, to, to, -, to, -, to};8 9      for(i=1;i< -; i++)Ten  One     { A  -days[i]+=days[i-1]; -  the     } -  -sum=days[m-1]+D; -  +     if(Leapyear (y)) -  +     { A  atsum+=1; -  -     } -  -     returnsum; -  in}

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iOS Introductory C language-basic function--3--judgment date is the day ordinal of a year