c++ - Parameter issue? at least i think it is - 


#include <iostream> #include <stdio.h> #include <iomanip>  using namespace std;  class date {     private:         int year;         int monthnum;         int daynum;      public:      date(int newyear = 1900, int newmonth = 1, int newday = 1);      void setdate(int changeyear, int changemonth, int changeday);     void displaynumerically();     void displaytextually(); };  int main() {

how make when setdate called , parameters incorrect returns date trying change

date f(1980, 6, 8); f.displaynumerically(); /// prints "06/08/1980" f.displaytextually(); /// prints "june 8, 1980"  f.setdate(1980, 6, 31); /// prints "error: setdate() called invalid date information" f.displaynumerically(); /// prints "06/08/1980" f.displaytextually(); /// prints "june 8, 1980"*

this section right above.

return 0; }  date::date(int newyear, int newmonth, int newday) {     year = newyear;     monthnum = newmonth;     daynum = newday;     if(newday > 30)     {          cout <<"error: date created invalid date information."<<endl;          year = 1900;          monthnum = 1;          daynum = 1;     } } void date::setdate(int changeyear, int changemonth, int changeday) {     year = changeyear;     monthnum = changemonth;     daynum = changeday;     if(changemonth > 12||changeday > 30)     {          cout <<"error: setdate() called invalid date information."<<endl;          year=1;          monthnum=1;          daynum=1;     } } void date::displaynumerically() {     printf("%02d",monthnum);     printf("/%02d",daynum);     printf("/%04d\n",year); }  void date::displaytextually() {     string m;     if( monthnum == 1)         m = "january";           else if( monthnum == 2)                 m = "february";             else if( monthnum == 3)                 m = "march";             else if( monthnum == 4)                 m = "april";             else if( monthnum == 5)                 m = "may";             else if( monthnum == 6)                 m = "june";             else if( monthnum == 7)                 m = "july";             else if( monthnum == 8)                 m = "august";             else if( monthnum == 9)                 m = "september";             else if( monthnum == 10)                 m = "october";             else if( monthnum == 11)                 m = "november";             else if( monthnum == 12)                 m = "december";                 else                     cout <<"invalid month input: "<< monthnum << endl;      cout << m <<" "<<fixed<<setprecision(2)<<daynum<<","<<year<<endl; }

just don't modify date when input faulty:

void date::setdate(int changeyear, int changemonth, int changeday) {     if(changemonth > 12||changeday > 30)     {          cout <<"error: setdate() called invalid date information."<<endl;     }     else     {         year = changeyear;         monthnum = changemonth;         daynum = changeday;     } }

(i'm assuming validity check illustration purposes.)


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