質問編集履歴
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コードを追加しました。
test
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File without changes
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test
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@@ -9,3 +9,106 @@
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C:\Users\user\AppData\Local\Temp\ccE3QDsf.o:DateTest1.cpp:(.text+0xd5): undefined reference to `operator<<(std::ostream&, Date const&)'
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collect2.exe: error: ld returned 1 exit status
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11
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```
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12
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+
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13
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コード
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14
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```C++
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15
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#ifndef ___Class_Date
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#define ___Class_Date
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+
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18
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#include <string>
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#include <iostream>
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21
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class Date{
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int y;
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int m;
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24
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int d;
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25
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public:
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Date();
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28
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Date(int yy, int mm = 1, int dd =1);
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29
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30
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int year() const { return y; }
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31
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int month() const { return m; }
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32
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int day() const { return d; }
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33
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34
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Date preceding_day() const;
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35
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36
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std::string to_string() const;
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37
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38
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int day_of_week() const;
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39
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};
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40
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+
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41
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std::ostream& operator<<(std::ostream& s, const Date& x);
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42
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std::istream& operator>>(std::istream& s, Date& x);
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43
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44
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#endif
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45
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```
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46
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```C++
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47
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#include <ctime>
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48
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#include <sstream>
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49
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#include <iostream>
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50
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#include "Date.h"
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51
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using namespace std;
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53
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Date::Date(){
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time_t current = time(NULL);
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56
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struct tm* local = localtime(¤t);
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57
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58
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y = local->tm_year + 1900;
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59
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m = local->tm_mon + 1;
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60
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d = local->tm_mday;
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61
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}
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62
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63
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Date::Date(int yy, int mm, int dd){
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y = yy;
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m = mm;
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d = dd;
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}
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68
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69
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Date Date::preceding_day() const{
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70
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int dmax[] = {31,28,31,30,31,30,31,31,30,31,30,31};
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71
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Date temp = *this;
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72
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if (temp.d > 1)
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temp.d--;
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else{
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if(--temp.m < 1){
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temp.y--;
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temp.m = 12;
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}
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temp.d = dmax[temp.m - 1];
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}
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return temp;
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}
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84
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85
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string Date::to_string() const{
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86
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ostringstream s;
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87
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s << y << "年" << m << "月" << d << "日";
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return s.str();
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}
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90
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91
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int Date::day_of_week() const{
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92
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int yy = y;
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93
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int mm = m;
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if ( mm == 1 || mm == 2){
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yy--;
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mm += 12;
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}
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return (yy + yy / 4 - yy / 100 + yy / 400 + (13 * mm + 8) / 5 + d) % 7;
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}
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100
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```
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101
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```C＋＋
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102
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#include <iostream>
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103
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#include "Date.h"
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104
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105
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using namespace std;
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106
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107
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int main(){
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108
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Date today;
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109
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cout << "今日" << today << "\n";
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111
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cout << "昨日" << today.preceding_day() << "\n";
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112
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cout << "昨日" << today.preceding_day().preceding_day() << "\n";
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}
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```
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