Help me about homework

Pages: 12
sonnguyen0604 (9)
Write a program that reads a whole number of up to NINE digits and prints it in words. For example, the input 13247 ought to produce thirteen thousand two hundred forty seven. Just only use #include <iostream>, use SWITCH statements. Thank you so much.
jonnin (11437)
you forgot to post your attempt and tell us why it is not working?
kbw (9488)
If you don't know where to start
* begin by doing yourself on paper
* write down the steps you used to do it

That'll give you an algorithm you can use.

Try to implement that algorithm in C++. If you're stuck, we can help, but we shouldn't do it for you; it's bad for everyone.
seeplus (6592)
That question has been asked before on these forums - so if you search you'll find it.
jonnin (11437)
yea but I don't think we did it with a bogus switch. There is always some 'do it a screwy way' addendum to prevent copying old ones.
Ganado (6810)
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switch (number)
{
    case 1:
        cout << "one";
    case 2:
        cout << "two";
    // ... < left as exercise for the reader >
    case 999999999:
        cout << "nine hundred ninety nine million nine hundred ninety nine thousand nine hundred ninety nine";
}
AbstractionAnon (6954)
@ganado - Haha.
I'd be surprised if there is a compiler out there that can handle more than 65,535 branches.
BTW, you forgot the break statements.
Ganado (6810)
How embarrassing :( Guess I failed whatever class OP has.
deleted account xyzzy (5768)
Write a program that reads a whole number of up to NINE digits and prints it in words.

Done!

What? You want me to show you what I did -- for free -- without even a hint you tried first yourself?
forgottencoder (88)
Hi Ganado

Big Lol. I am going to help too.

Hi sonnguyen just make program divide the input number by 10 and write "ten" n times. Then add the remainder from 1 to 9.

input number 4 just write "four"
input number 11 just write "ten one"
input number 23 just write "ten ten three"
input number 106 just write "ten ten ten ten ten ten ten ten ten ten six"
...
input number 999999999 just write "ten ... ... ... nine"

Last edited on
jonnin (11437)
reminds me of an old puzzler
O T T F F S S E
what is next in the pattern...

sonnguyen0604 (9)
I try code but Unexpected results. Can you help me fix it? Thank you.
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#include <iostream>

using namespace std;

//Read number one digit
void one(int x)
{
    switch(x){
        case 1:
            cout<<"one";
            break;
        case 2:
            cout<<"two";
            break;
        case 3:
            cout<<"three";
            break;
        case 4:
            cout<<"four";
            break;
        case 5:
            cout<<"five";
            break;
        case 6:
            cout<<"six";
            break;
        case 7:
            cout<<"seven";
            break;
        case 8:
            cout<<"eight";
            break;
        case 9:
            cout<<"nine";
            break;
    }
}

//Read ten number
void ten(int x)
{
    switch(x){
        case 1:
            cout<<"ten";
            break;
        case 2:
            cout<<"twenty";
            break;
        case 3:
            cout<<"thirty";
            break;
        case 4:
            cout<<"forty";
            break;
        case 5:
            cout<<"fifrty";
            break;
        case 6:
            cout<<"sixty";
            break;
        case 7:
            cout<<"seventy";
            break;
        case 8:
            cout<<"eighty";
            break;
        case 9:
            cout<<"ninety";
            break;
    }
}

//Read number hundred
void hundred(int x)
{
    switch(x){
        case 1:
            cout<<"one hundred";
            break;
        case 2:
            cout<<"two hundred";
            break;
        case 3:
            cout<<"three hundred";
            break;
        case 4:
            cout<<"four hundred";
            break;
        case 5:
            cout<<"five hundred";
            break;
        case 6:
            cout<<"six hundred";
            break;
        case 7:
            cout<<"seven hundred";
            break;
        case 8:
            cout<<"eight hundred";
            break;
        case 9:
            cout<<"nine hundred";
            break;
    }
}

//Read a thousand number
void thousand(int x)
{
    switch(x){
        case 1:
            cout<<"one thousand";
            break;
        case 2:
            cout<<"two thousand";
            break;
        case 3:
            cout<<"three thousand";
            break;
        case 4:
            cout<<"four thousand";
            break;
        case 5:
            cout<<"five thousand";
            break;
        case 6:
            cout<<"six thousand";
            break;
        case 7:
            cout<<"seven thousand";
            break;
        case 8:
            cout<<"eight thousand";
            break;
        case 9:
            cout<<"nine thousand";
            break;
    }
}

//Read a thousand number
void tensthousand(int x)
{
    switch(x){
        case 1:
            cout<<"one thousand";
            break;
        case 2:
            cout<<"two thousand";
            break;
        case 3:
            cout<<"three thousand";
            break;
        case 4:
            cout<<"four thousand";
            break;
        case 5:
            cout<<"five thousand";
            break;
        case 6:
            cout<<"six thousand";
            break;
        case 7:
            cout<<"seven thousand";
            break;
        case 8:
            cout<<"eight thousand";
            break;
        case 9:
            cout<<"nine thousand";
            break;
    }
}

//Read a number tens of thousands
void tenshundredthousands(int x)
{
    switch(x){
        case 1:
            cout<<"ten thousand";
            break;
        case 2:
            cout<<"twenty thousand";
            break;
        case 3:
            cout<<"thirty thousand";
            break;
        case 4:
            cout<<"fourty thousand";
            break;
        case 5:
            cout<<"fifty thousand";
            break;
        case 6:
            cout<<"sixty thousand";
            break;
        case 7:
            cout<<"seventy thousand";
            break;
        case 8:
            cout<<"eighty thousand";
            break;
        case 9:
            cout<<"ninety thousand";
            break;
    }
}

//Read a number million
void million(int x)
{
    switch(x){
        case 1:
            cout<<"one million";
            break;
        case 2:
            cout<<"two million";
            break;
        case 3:
            cout<<"three million";
            break;
        case 4:
            cout<<"four million";
            break;
        case 5:
            cout<<"five million";
            break;
        case 6:
            cout<<"six million";
            break;
        case 7:
            cout<<"seven million";
            break;
        case 8:
            cout<<"eight million";
            break;
        case 9:
            cout<<"nine million";
            break;
    }
}

//Read a number ten million
void tenmillion(int x)
{
    switch(x){
        case 1:
            cout<<"ten million";
            break;
        case 2:
            cout<<"twenty million";
            break;
        case 3:
            cout<<"thirty million";
            break;
        case 4:
            cout<<"fourty million";
            break;
        case 5:
            cout<<"fifty million";
            break;
        case 6:
            cout<<"sixty million";
            break;
        case 7:
            cout<<"seventy million";
            break;
        case 8:
            cout<<"eighty million";
            break;
        case 9:
            cout<<"ninety million";
            break;
    }
}

//Read a number hundred  million
void hundredmillion(int x)
{
    switch(x){
        case 1:
            cout<<"one hundred million";
            break;
        case 2:
            cout<<"two hundred million";
            break;
        case 3:
            cout<<"three hundred million";
            break;
        case 4:
            cout<<"four hundred million";
            break;
        case 5:
            cout<<"five hundred million";
            break;
        case 6:
            cout<<"six hundred million";
            break;
        case 7:
            cout<<"seven hundred million";
            break;
        case 8:
            cout<<"eight hundred million";
            break;
        case 9:
            cout<<"nine hundred million";
            break;
    }
}

int main()
{
    int n, a, b, c, d, e, f, g, h, t;
    cout<<"Input a 9 digit positive: ";
    cin>>n;
    
    //Separate numbers in millions, hundreds of thousands, tens of thousands, thousands, hundreds, tens, and units
    a = n%10;
    b = (n/10)%10;
    c = (n/100)%10;
    d = (n/1000)%10;
    e = (n/10000)%10;
    f = (n/100000)%10;
    g = (n/1000000)%10;
    h = (n/10000000)%10;
    t = (n/100000000)%10;

    //Read the numbers just split above
    if(n<10)
    {
        one(a); 
        cout<<a<<endl;
    }
    else if(n>=10 && n<100)
    {
        ten(b); 
        cout<<b<<endl;
    }    
    else if(n>=100 && n<1000)
    {
        hundred(c);
        cout<<c<<endl;
    }
    else if(n>=1000 && n<10000)
    {
        thousand(d);
        cout<<d<<endl;
    }
    else if(n>=10000 && n<100000)
    {
        tensthousand(f);
        cout<<f<<endl;
    }
    else if(n>=100000 && n<1000000)
    {
        tenshundredthousands(g);
        cout<<g<<endl;
    }
    else if(n>=1000000 && n<10000000)
    {
        million(h);
        cout<<h<<endl;
    }
    else if(n>=10000000 && n<100000000)
    {
        tenmillion(f);
        cout<<f<<endl;
    }
    else
    {
        hundredmillion(t);
        cout<<t<<endl;
    }
    return 0;
}
Last edited on
AbstractionAnon (6954)
Can you be more specific than just saying "unexpected results"?

PLEASE ALWAYS USE CODE TAGS (the <> formatting button) when posting code.
It makes it easier to read your code and also easier to respond to your post.
http://www.cplusplus.com/articles/jEywvCM9/
Hint: You can edit your post, highlight your code and press the <> formatting button.

Do you see a pattern in your functions?
You can shorten your code significantly.
Consider:
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void million (int x)
{   one(x);  //  prints one-nine
    cout << " million";
}


Don't forget that eleven through nineteen require special handling.
Last edited on
sonnguyen0604 (9)
Yes, I edit the topic. I will fix it.
Last edited on
sonnguyen0604 (9)
You can help me how to handle eleven through nineteen. Thank you
jonnin (11437)
there is no way to do 11-19 any better than one at a time.
one way... you can make a table of strings such that table[11] returns "eleven" and so on.
after 20 the patterns are nice and easy to work with, though. its typically 0-100 of a thing, eg "forty two thousand"

or since you are doing switches, a switch.
Last edited on
AbstractionAnon (6954)
This should get you started: 

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#include <iostream>

using namespace std;

void ones(int x)
{
	switch (x) {
	case 1:
		cout << "one";
		break;
	case 2:
		cout << "two";
		break;
	case 3:
		cout << "three";
		break;
	case 4:
		cout << "four";
		break;
	case 5:
		cout << "five";
		break;
	case 6:
		cout << "six";
		break;
	case 7:
		cout << "seven";
		break;
	case 8:
		cout << "eight";
		break;
	case 9:
		cout << "nine";
		break;
	}
	cout << " ";
}

void tens(int x)
{
	switch (x) {
	case 1:
		cout << "ten";
		break;
	case 2:
		cout << "twenty";
		break;
	case 3:
		cout << "thirty";
		break;
	case 4:
		cout << "forty";
		break;
	case 5:
		cout << "fifrty";
		break;
	case 6:
		cout << "sixty";
		break;
	case 7:
		cout << "seventy";
		break;
	case 8:
		cout << "eighty";
		break;
	case 9:
		cout << "ninety";
		break;
	}
	cout << " ";
}

void hundreds(int x)
{
	ones(x);
	cout << "hundred ";
}

void format(int n)
{
	int a, b, c, d, e, f, g, h, t;

	//Separate numbers in millions, hundreds of thousands, tens of thousands, thousands, hundreds, tens, and units
	a = n % 10;					//	1
	b = (n / 10) % 10;			//	10
	c = (n / 100) % 10;			//	100
	d = (n / 1000) % 10;		//	1,000	
	e = (n / 10000) % 10;		//	10,000
	f = (n / 100000) % 10;		//	100,000
	g = (n / 1000000) % 10;		//	1,000,000
	h = (n / 10000000) % 10;	//	10,000,000
	t = (n / 100000000) % 10;	//	100,000,000
	
	if (t || h || g)
	{
		if (t)
			hundreds(t);
		if (h)
			tens(h);
		if (g)
			ones(g);
		cout << "millions ";
	}
	if (f || e || d)
	{
		if (f)
			hundreds(f);
		if (e)
			tens(e);
		if (d)
			ones(d);
		cout << "thousands ";
	}
	if (c)
		hundreds(c);
	if (b)
		tens(b);
	if (a)
		ones(a);
	cout << endl;
}

int main()
{
	int n;

	do
	{
		cout << "Input a 9 digit positive (0 to stop): ";
		cin >> n;
		if (n)
			format(n);
	} while (n);
	return 0;
}


I leave you to deal with 11-19 correctly.
sonnguyen0604 (9)
Yes, thank you so much. I fix my code but have a problem when my code output. I input 6 --> hundred million hundred thousand hundred six. I do not how to remove hundred million hundred thousand hundred six. Can you help me?

My code

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#include <iostream>
using namespace std;

//Break the number into three three-digit numbers
void breakapart(int n, int &a, int &b, int &c)
{   
    c = n%1000;
    n = n/1000;
    
    b = n%1000;
    n = n/1000;
    
    a = n%1000;
    n = n/1000;
}

void writeSingle(int digit)
{
    switch(digit)
    {
        case 1: cout<<"one "; break;
        case 2: cout<<"two "; break;
        case 3: cout<<"three "; break;
        case 4: cout<<"four "; break;
        case 5: cout<<"five "; break;
        case 6: cout<<"six "; break;
        case 7: cout<<"seven "; break;
        case 8: cout<<"eight "; break;
        case 9: cout<<"nine "; break;
    }
}

void writeTens(int tensD, int onesD)
{
    switch(tensD)
    {
        case 1: 
        switch(onesD)
        {
            case 0: cout<<"ten "; break;
            case 1: cout<<"eleven "; break;
            case 2: cout<<"twelve "; break;
            case 3: cout<<"thirteen "; break;
            case 4: cout<<"fouteen "; break;
            case 5: cout<<"fiftenn "; break;
            case 6: cout<<"sixteen "; break;
            case 7: cout<<"seventeen "; break;
            case 8: cout<<"eighteen "; break;
            case 9: cout<<"nineteen "; break;
        }
        break;
        case 2: cout<<"twenty "; break;
        case 3: cout<<"thirty "; break;
        case 4: cout<<"fourty "; break;
        case 5: cout<<"fifty "; break;
        case 6: cout<<"sixty "; break;
        case 7: cout<<"seventy "; break;
        case 8: cout<<"eighty "; break;
        case 9: cout<<"ninty "; break;
    }
}

void writeNum(int n)
{
    // break number into single digit
    int one, two, three;
    
    three = n%10;
    n = n/10;
    
    two = n%10;
    n = n/10;
    
    one = n;
    
    writeSingle(one);
    cout<<"hundred ";
    writeTens(two, three);
    writeSingle(three);
}

int main()
{
    int num, first, second, third;
    cout<<"Input a 9 digit number ";
    cin>>num;
    // Break the number into three three-digit numbers
    breakapart(num,first,second,third);
    writeNum(first);
    cout<<"million ";
    writeNum(second);
    cout<<"thousand ";
    writeNum(third);
    return 0;
}
Last edited on
forgottencoder (88)
Hi sonnguyen

hint:

if my number has one digit start calculations for one digit
if my number has two digits start calculations for two digits
...
jonnin (11437)
the number of digits in an integer is log10()+1 (in decimal format).
Last edited on
Pages: 12