Thread: Help with Concatenating 2 integers

Hello everyone. It's already been 2 days since i've been stuck with one problem. Professor wants us to read the user's date of birth: 2 digits for the month and 2 digits for the day into a c-string that has room for the 4 digits entered example (0506) and then print the date of birth in May 6 format. Any help is appreciated. Thanks

Ooh, do you have to use C-strings? If you can use std::string, it automatically supports string concatenation through operator+.

Yes. He wants us to use C-strings. Im not sure how that would work.

What have you tried?

Jim

Well, basically allocate data to store the user input and allocate data to store the result of the string concatenation.

Read in user input to allocated blocks, then using something strncat to concatenate.

I tried this but it didnt work.

Code:

#include <iostream>
#include <conio.h>
#include <string>
using namespace std;
int main()


{
	//c-string: the original c language string.
	int month, day;
	string str;
	char month1[3], day1[3];


	cout << "Enter birth date: ";
	cin >> str;
	day = atoi(day1);
	str = (month1 + day);
	
	month = atoi(month1);
	
	if (month == 01)
		cout << "january";
	else if (month == 02)
		cout << "february";
	else if (month == 03)
		cout << "march";
	else if (month == 04)
		cout << "april";
	else if (month == 05)
		cout << "may";
	else if (month == 06)
		cout << "june";
	else if (month == 07)
		cout << "july";
	else if (month == 8)
		cout << "august";
	else if (month == 9)
		cout << "september";
	else if (month == 10)
		cout << "october";
	else if (month == 11)
		cout << "november";
	else if (month == 12)
		cout << "december";
	else if (month > 12)
		cout << "Invalid";


	cout << str;
	_getch();//to pause the program
	return 0;
}

I thought you needed to use a C-string, not a std::string. Where is your code using a C-string to get the date from the user?

Jim

That's the part I cant figure out.

What exactly don't you understand?

You were told to use a C-string that is large enough to hold the date entered by the user.

Professor wants us to read the user's date of birth: 2 digits for the month and 2 digits for the day into a c-string that has room for the 4 digits entered example (0506)

How do you create a C-string that is large enough to hold 4 digits?

Jim

Would i have Declare
Char str[5]?
Then use atoi to for conversion?

The declaration is correct by before you can use atoi() you will need to somehow separate the day and the month. You may want to review your C textbook on how to split the C-strings.

And don't forget to review your C textbook for methods on limiting how many characters the input will try to retrieve to avoid buffer overflows.

Jim