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Convert lower case letters to upper case letters in C++? - Page 2

post #11 of 21
Quote:
Originally Posted by Kokin View Post

Why not just have it so that when # is entered, your index supersedes the counter?
Code:

int main()
{
        char text [MAX+1];
        cout << "Input '10' letters, followed by '#' symbol";
        cin >> text;
        int arraySize = sizeof(text) / sizeof(text[0]); //This gets the size of your array.
        void putInUppercase(char&, arraySize); putInUppercase(text[MAX+1], arraySize); //Make sure you add the extra parameter for your function
        system("pause");
}

void putInUppercase(char& text, int arraySize) //Extra parameter for function added
{
        for (int index = 0; index < arraySize; index++)
        {
           if( text[index] == EOT )
           index = some number higher than your arraySize; // you set this to whatever you like, this breaks your for loop
           toupper(text[index + 1]);    
        }
}

I also don't get why you have a system pause at the end?

No need to do that, just use the "break;" statement.

system( "pause" ) is used on Windows to ensure the console window doesn't close at the end of execution. You could also set a breakpoint at the end of main..
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post #12 of 21
BTW here's a quick few liner to convert an entire character array/string to upper case (requires null terminated string):
Code:
void convert_to_upper ( char *string )
{
        while ( *string++ = toupper( *string ) );
}
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post #13 of 21
Thread Starter 
Quote:
Originally Posted by tompsonn View Post

BTW here's a quick few liner to convert an entire character array/string to upper case (requires null terminated string):
Code:
void convert_to_upper ( char *string )
{
        while ( *string++ = toupper( *string ) );
}

That's interesting!
At the moment, all I was doing is:
Code:
//Insert FOR LOOP here.
test[i] = toupper (text[i]) //Or something like that.

Then I was looking to convert the text array to string.
I guess that line of code you posted is an all in one.
Thank you.
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post #14 of 21
Quote:
Originally Posted by BradleyW View Post

That's interesting!
At the moment, all I was doing is:
Code:
//Insert FOR LOOP here.
test[i] = toupper (text[i]) //Or something like that.

Then I was looking to convert the text array to string.
I guess that line of code you posted is an all in one.
Thank you.

Indeed, I'm just using pointer arithmetic to get rid of the for loop. So we increment the pointer by one each time (we get the next character in the array after each increment). Once it reaches the null terminator (which is applied by default by the compiler in string literals), the loop stops. I'm a stickler for less code tongue.gif

Pointer arithmetic is basically the same as your for loop. When you do:
Code:
char text[] = "this is a string";

And you operate on it:
Code:
char single = text[2];

It is the same as:
Code:
char single = *( text + 2 * sizeof( char ) ); /* sizeof(char) == 1 and n == 2, so address is (text + n*1) */

Though the compiler calculates the size for you automatically so you can just write:
Code:
char single = *( text + 2 );

Stupidly enough you can also do this because the subscript operator is commutative:
Code:
char single = 2[text];
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post #15 of 21
Thread Starter 
Quote:
Originally Posted by tompsonn View Post

Indeed, I'm just using pointer arithmetic to get rid of the for loop. So we increment the pointer by one each time (we get the next character in the array after each increment). Once it reaches the null terminator (which is applied by default by the compiler in string literals), the loop stops. I'm a stickler for less code tongue.gif
Agreed, less code the better. More optimal in most cases (Generally speaking).
Thanks man!
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post #16 of 21
Quote:
Originally Posted by BradleyW View Post

Agreed, less code the better. More optimal in most cases (Generally speaking).
Thanks man!

See post editor for some funzies biggrin.gif
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post #17 of 21
Thread Starter 
Quote:
Originally Posted by tompsonn View Post

See post editor for some funzies biggrin.gif

So many methods, so little time! biggrin.gif
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post #18 of 21
Quote:
Originally Posted by BradleyW View Post

So many methods, so little time! biggrin.gif

tongue.gif

Ah, the C language. So many ways to shoot yourself in the foot biggrin.gif
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post #19 of 21
Thread Starter 
Quote:
Originally Posted by tompsonn View Post

tongue.gif

Ah, the C language. So many ways to shoot yourself in the foot biggrin.gif

QFT
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X79-GCN
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CPUMotherboardGraphicsRAM
Intel 3930K 4.5GHz HT GIGABYTE GA-X79-UP4 AMD R9-290X GEil Evo Potenza DDR3 2400MHz CL10 (4x4GB) 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 120GB EK Supremacy (CPU) NF F12's P/P (360 Rad)  NF A14's (420 Rad)  
CoolingCoolingCoolingCooling
XSPC Chrome Compression Fittings EK RES X3 150 Primochill PremoFlex Advanced LRT Clear 1/2 ID EK-FC (R9 290X) 
CoolingCoolingCoolingOS
EK D5 Vario Top-X  Phobya G-Changer V2 360mm Phobya G-Changer V2 420mm Win 10 x64 Pro 
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BenQ XR3501 35" Curved Corsair Vengeance K90 Seasonic X-1250 Gold (v2) Corsair 900D 
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post #20 of 21
You could check the ascii value and if its between 97 and 122 , subtract 32. =D
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Zev's Comp
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