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  1. /*
  2. 寫一個程式計算給定日期為星期幾。輸入會先告訴程式某年的 1 月 1 號為星期幾，例如範例中 2012 年的 1 月 1 號為星期日。接著程式會收到一些日期，並要計算出給定日期為星期幾，例如範例中程式將會收到 11 月 13 號，並計算出該日期為星期二。
  3. */
  4.  
  5. #include <stdio.h>
  6.  
  7. int main ()
  8. {
  9.    int y, d;
  10.    int n;
  11.    int month, day;
  12.    int leap_year;
  13.    int days;
  14.  
  15.    scanf ( "%d%d", &y, &d );
  16.    scanf ( "%d", &n );
  17.  
  18.    // leap year or not
  19.    leap_year = y % 400 == 0 || ( y % 100 && y % 4 == 0 );
  20.  
  21.    // calculate each input line
  22.    for ( int i = 0; i < n; i++ ) {
  23.       if ( i ) printf ( " " );
  24.  
  25.       days = d;
  26.       scanf ( "%d%d", &month, &day );
  27.  
  28.       if ( month < 1 || month > 12 ) {
  29.          printf ( "-1" );
  30.          continue;
  31.       }
  32.       if ( day < 1 ) {
  33.          printf ( "-2" );
  34.          continue;
  35.       }
  36.       else {
  37.          switch ( month ) {
  38.             case 2:
  39.                if ( ( leap_year && day > 29 ) ||
  40.                     ( !leap_year && day > 28 ) ) {
  41.                   printf ( "-2" );
  42.                   continue;
  43.                }
  44.                break;
  45.             case 4: case 6: case 9: case 11:
  46.                if ( day > 30 ) {
  47.                   printf ( "-2" );
  48.                   continue;
  49.                }
  50.                break;
  51.             default:
  52.                if ( day > 31 ) {
  53.                   printf ( "-2" );
  54.                   continue;
  55.                }
  56.          }
  57.       }
  58.  
  59.       for ( int m = 1; m < month; m++ ) {
  60.          switch ( m ) {
  61.             case 2:
  62.                if ( leap_year ) days += 29;
  63.                else days += 28;
  64.                break;
  65.             case 4: case 6: case 9: case 11:
  66.                days += 30;
  67.                break;
  68.             default:
  69.                days += 31;
  70.          }
  71.       }
  72.  
  73.       days += ( day - 1 );
  74.       printf ( "%d", days % 7 );
  75.    }
  76.  
  77.    return 0;
  78. }
Success #stdin #stdout 0s 2160KB
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stdin
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Standard input is empty
stdout
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-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
https://ideone.com/bQ9YY3
課程2測驗-解答
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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