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Array help

 
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  #1
Apr 6th, 2006
I don't know if I read the book right but my array is not working on my months .My instructions is

this assignment uses an array of strings:

write a C program that asks the user for the month, day, and year

read in the month, day and year (as ints)

the function header should be void PrintMonth(int month)

the function accepts the month as a parameter and prints out the proper month name

the function does not have to verify a valid date

best approch is to declare an array of 12 strings and initialize the elements of the array with the proper month name





C++ Syntax (Toggle Plain Text) 
  1.  /****************************
  2. *    prototypes    //declared function so main can find
  3. *****************************/
  4. void printMonth(int m);
  5.  
  6.  
  7. /**************************************
  8. *
  9. ***************************************/
  10.  
  11.  
  12. char month[13] =
  13. {"January","Febuary","March", "April", "May", "June", "July", "August", 
  14. "September", "October", "November", "December"};
  15.  
  16.  int main()
  17. {
  18.      int month;
  19.      int day;
  20.      int year;
  21.    cout << "enter the month: ";
  22.    cin >> month;
  23.    cout << "enter the day: ";
  24.    cin >> day;
  25.    cout << "enter the \year: ";
  26.    cin >> year;
  27.    cin.ignore();
  28.  
  29.    cout << month << " " << day << " " << year << "\n";
  30.  
  31.    cin.get();
  32.  
  33. system("pause");
  34. }
  35. void printMonth(int m)
  36. {
  37.      cout << month[m] << "\n";
  38. }
Last edited by jlouang; Apr 6th, 2006 at 1:18 am. Reason: help
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Re: Array help

 
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  #2
Apr 6th, 2006
would anything happen if I change my array to a constant?

char* month[100] =
{"January","Febuary","March", "April", "May", "June", "July", "August",
"September", "October", "November", "December"};
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Re: Array help

 
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  #3
Apr 7th, 2006
> char month[13]
Try
char *month[12]={"January","Febuary","March", "April", "May", "June", "July", "August",
"September", "October", "November", "December"};

> cout << month << " " << day << " " << year << "\n";
You also need to actually call the function as well, say
printMonth( month );
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Re: Array help

 
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  #4
Apr 7th, 2006
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Originally Posted by jlouang
I don't know if I read the book right but my array is not working on my months .My instructions is

this assignment uses an array of strings:

write a C program that asks the user for the month, day, and year

read in the month, day and year (as ints)

the function header should be void PrintMonth(int month)

the function accepts the month as a parameter and prints out the proper month name

the function does not have to verify a valid date

best approch is to declare an array of 12 strings and initialize the elements of the array with the proper month name





C++ Syntax (Toggle Plain Text) 
  1.  /****************************
  2. *    prototypes    //declared function so main can find
  3. *****************************/
  4. void printMonth(int m);
  5.  
  6.  
  7. /**************************************
  8. *
  9. ***************************************/
  10.  
  11.  
  12. char month[13] =
  13. {"January","Febuary","March", "April", "May", "June", "July", "August", 
  14. "September", "October", "November", "December"};
  15.  
  16.  int main()
  17. {
  18.      int month;
  19.      int day;
  20.      int year;
  21.    cout << "enter the month: ";
  22.    cin >> month;
  23.    cout << "enter the day: ";
  24.    cin >> day;
  25.    cout << "enter the \year: ";
  26.    cin >> year;
  27.    cin.ignore();
  28.  
  29.    cout << month << " " << day << " " << year << "\n";
  30.  
  31.    cin.get();
  32.  
  33. system("pause");
  34. }
  35. void printMonth(int m)
  36. {
  37.      cout << month[m] << "\n";
  38. }


Cann't understand ur question & the code u hav given.
U r asking for a 'C' program, but i think cin & cout are used in C++

Moreover...
U are using char month[13] to store names of 12 months.
but this will store a string of length 12 characters only?
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Re: Array help

 
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  #5
Apr 7th, 2006
First, don't have two variables with the same name:

int month;
char * month[12];

So let's say you change:

int month;

to

int num;

Then to use the cout << syntax it would be

cout << month[num] << " " << day << " " << year << \n;

or if you want to use your function the equivalent syntax to the above would be:

printMonth(num);
cout << " " << day << " " << year << \n;

assuming you drop the newline char at the end of the cout statement in printMonth()
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Re: Array help

 
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  #6
Apr 11th, 2006
o gotcha thanks
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Re: Array help

 
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  #7
Apr 12th, 2006
ok I'm trying to compile the leap year thing but the if else not showing?

here my compile
C++ Syntax (Toggle Plain Text) 
  1.  
  2. #include <iostream>                       // needed for cin/count
  3. #include <cmath>                         // needed for math functions
  4. using namespace std;
  5.  
  6. /****************************
  7. *    prototypes    //declared function so main can find
  8. *****************************/
  9. void printMonth(int m);
  10. void calcDOY(int month, int day, int year); 
  11.  
  12.  
  13. /**************************************
  14. *
  15. ***************************************/
  16.  
  17.  
  18. int day[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
  19.  
  20.  
  21.  
  22.  int main()
  23. {
  24.      int month;
  25.      int day;
  26.      int year;
  27.    cout << "enter the month: ";
  28.    cin >> month;
  29.    cout << "enter the day: ";
  30.    cin >> day;
  31.    cout << "enter the year: ";
  32.    cin >> year;
  33.  
  34.    if ((year % 400)==0){
  35.    cout << "This  a leap year\n";
  36.    } 
  37.  
  38.    else if ((year % 100)==0){
  39.    cout << "This is not a leap year \n";
  40.    }
  41.  
  42.  
  43.  
  44. cin.get();
  45.  
  46. system("pause");
  47. }
  48. void printMonth(int m)
  49. {
  50.      cout << day[m] << "\n";
  51. }
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Re: Array help

 
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  #8
Apr 12th, 2006
Can you paste a log of your run, showing the prompts being printed and the values you typed in?
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Re: Array help

 
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  #9
Apr 12th, 2006
hmm I fix it alittle but the leap years still printing

C++ Syntax (Toggle Plain Text) 
  1.  #include <iostream>                       // needed for cin/count
  2. #include <cmath>                         // needed for math functions
  3. using namespace std;
  4.  
  5. /****************************
  6. *    prototypes    //declared function so main can find
  7. *****************************/
  8. void printMonth(int m);
  9. void getDOY(int m, int d, int y);
  10.  
  11.  
  12.  
  13. /**************************************
  14. *
  15. ***************************************/
  16.  
  17.  
  18. int month[] = {31,28,31,30,31,30,31,31,30,31,30,31};
  19.  
  20.  
  21.  
  22.  int main()
  23. {
  24.    int month;
  25.    int day;
  26.    int year;
  27.    cout << "enter the month: ";
  28.    cin >> month;
  29.    cout << "enter the day: ";
  30.    cin >> day;
  31.    cout << "enter the year: ";
  32.    cin >> year;
  33.  
  34.    getDOY( month, day, year);
  35.  
  36.    return 0;
  37.  
  38.  
  39. system("pause");
  40. }
  41. void printMonth(int m)
  42. {
  43.      cout << month[m] << "\n";
  44.  
  45. }
  46. void getDOY(int m, int d, int y)
  47. {
  48.    if ((year % 400)==0){
  49.    cout << "This  a leap year\n";
  50.    } 
  51.  
  52.    if ((year % 100)==0){
  53.    cout << "This is not a leap year \n";
  54.    }  
  55.    return 0;
  56. }
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Re: Array help

 
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  #10
Apr 12th, 2006
> if ((year % 400)==0)
How is this even compiling, when all you have is a parameter called 'y' ?

> return 0;
How is this even compiling, when you declared it as returning void?
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