Programming Forums > Application Development > C++

programmingnoob · Apr 15th, 2006, 4:57 PM

so i am looking at a code snippet written by my prof.

and it says :

int c; 
string s; 
....
s =  c;

^^^ wouldnt that give data type mismatch?

but how could my prof do it?

mrynit · Apr 15th, 2006, 5:09 PM

Quote:

#include <iostream>
#include <string>
using namespace std;

int main()
{
int c = 66;
string s;

cout << "c = " << c << endl;

cout << "s is empty now" << endl;

s = c;

cout << "s is now = " << s << endl;

return 0;
}

ASCII

DaWei · Apr 15th, 2006, 5:09 PM

No. The assignment operator for the string class is overloaded to accept that. Don't expect to be able to predict what goes in the string for large integers unless you're more of a mental mathematical-conversion whiz than I.

programmingnoob · Apr 15th, 2006, 5:19 PM

Quote:

Originally Posted by mrynit

ASCII

(Toggle Plain Text)

int main () 
{ 
	int c = 5;
	string s = "runsilol";
	s = c; 
	cout << c; 	
	cin.get ();
}

^^ you know what it gave me?? clubs! (yeah the clubs of card games)

programmingnoob · Apr 15th, 2006, 5:20 PM

well ... i am still confused

programmingnoob · Apr 15th, 2006, 5:21 PM

Quote:

Originally Posted by DaWei

No. The assignment operator for the string class is overloaded to accept that. Don't expect to be able to predict what goes in the string for large integers unless you're more of a mental mathematical-conversion whiz than I.

so ... what does s = c do? i mean what value does it assign to s?

programmingnoob · Apr 15th, 2006, 5:35 PM

(Toggle Plain Text)

SymTab<Attributes> ST1;

int remWS() // result is first non-white space char
    {int c;
    c = cin.get(); cout.put(c);
    if (isspace(c)) return remWS();
        else return c;}

void appnd(char c, string & s) // appends c to the end of s
    {string s1;
    s1 = c;
    s.append(s1);}

item<Attributes>* Scanner::get() // returns next token
    {int c;                      // tokens: ( ) + - * / Int
    string s;
    item<Attributes>* x;
    c = remWS();
    s = c;
    if (isdigit(c))
        {c = cin.peek();
        while (isdigit(c))
            {appnd (c, s);
            c = cin.get(); cout.put(c);
            c= cin.peek();}
        x = ST1.insert(s);
        x->attr.type = Int;
        x->attr.value = atoi(s.c_str());}
        else {x = ST1.find(s); // ( ) + - * / prestored in ST1
            if (x == NULL) 
                {   // another possibility is to scan
                    // until next white space with
                    // while (!isspace(c))
                    //     {appnd(c, s);
                    //     c = cin.get(); cout.put(c);}
                x = ST1.insert(s); // s not ( ) + - * /
                x->attr.type = error;}}
    return x;}

look at the function item<Attributes>* Scanner::get()
what is s = c trying to do?

DaWei · Apr 15th, 2006, 6:00 PM

Don't get your panties in a wad and don't expect us to be hanging on your thread with bated breath. Leave the monologues to Jay Leno. It assigns the value of c to the string. If c represents a printable character, then that's what you get. You would get 'B' if c were 66 and your system dealt in ASCII.

programmingnoob · Apr 15th, 2006, 6:14 PM

Quote:

Originally Posted by DaWei

Don't get your panties in a wad and don't expect us to be hanging on your thread with bated breath. Leave the monologues to Jay Leno. It assigns the value of c to the string. If c represents a printable character, then that's what you get. You would get 'B' if c were 66 and your system dealt in ASCII.

argh i got that ...

calm down first ...

what i dont understand is how that code is using it ...

like sometimes it would use c as a char as well ... and that doesnt make much sense ... but hey i am a programming noob

oh btw if you dont wanna post in my thread, then nobody is forcing you bro

DaWei · Apr 15th, 2006, 6:38 PM

Just make your question clear. Here's your original one:

Quote:

^^ wouldnt that give data type mismatch?

You got an answer, right? Then you got all excited, and after jabbering around like a pregnant woman in her first labor, decided you had another one:

Quote:

what does s = c do? i mean what value does it assign to s?

Then you got an answer to that, right? We can't help it if you don't know how to ask a question. Go read the "How to Ask a Question" thread, and follow that link in the Rules/FAQ to "How to ask questions the smart way." Meanwhile, don't tell me where to post. No one is forcing me, there may be other members who would like to see the answer, we didn't just come here to serve you. Go off and sit behind the barn and think a bit after you read up on things.

Apr 15th, 2006, 4:57 PM	#1
programmingnoob Hobbyist Programmer Join Date: Feb 2006 Posts: 155 Rep Power: 3	c++ string ... interesting... so i am looking at a code snippet written by my prof. and it says : (Toggle Plain Text) int c; string s; .... s = c; int c; string s; .... s = c; ^^^ wouldnt that give data type mismatch? but how could my prof do it?

Apr 15th, 2006, 5:09 PM	#3
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	No. The assignment operator for the string class is overloaded to accept that. Don't expect to be able to predict what goes in the string for large integers unless you're more of a mental mathematical-conversion whiz than I. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Apr 15th, 2006, 5:35 PM	#7
programmingnoob Hobbyist Programmer Join Date: Feb 2006 Posts: 155 Rep Power: 3	(Toggle Plain Text) SymTab<Attributes> ST1; int remWS() // result is first non-white space char {int c; c = cin.get(); cout.put(c); if (isspace(c)) return remWS(); else return c;} void appnd(char c, string & s) // appends c to the end of s {string s1; s1 = c; s.append(s1);} item<Attributes>* Scanner::get() // returns next token {int c; // tokens: ( ) + - * / Int string s; item<Attributes>* x; c = remWS(); s = c; if (isdigit(c)) {c = cin.peek(); while (isdigit(c)) {appnd (c, s); c = cin.get(); cout.put(c); c= cin.peek();} x = ST1.insert(s); x->attr.type = Int; x->attr.value = atoi(s.c_str());} else {x = ST1.find(s); // ( ) + - * / prestored in ST1 if (x == NULL) { // another possibility is to scan // until next white space with // while (!isspace(c)) // {appnd(c, s); // c = cin.get(); cout.put(c);} x = ST1.insert(s); // s not ( ) + - * / x->attr.type = error;}} return x;} SymTab<Attributes> ST1; int remWS() // result is first non-white space char {int c; c = cin.get(); cout.put(c); if (isspace(c)) return remWS(); else return c;} void appnd(char c, string & s) // appends c to the end of s {string s1; s1 = c; s.append(s1);} item<Attributes>* Scanner::get() // returns next token {int c; // tokens: ( ) + - * / Int string s; item<Attributes>* x; c = remWS(); s = c; if (isdigit(c)) {c = cin.peek(); while (isdigit(c)) {appnd (c, s); c = cin.get(); cout.put(c); c= cin.peek();} x = ST1.insert(s); x->attr.type = Int; x->attr.value = atoi(s.c_str());} else {x = ST1.find(s); // ( ) + - * / prestored in ST1 if (x == NULL) { // another possibility is to scan // until next white space with // while (!isspace(c)) // {appnd(c, s); // c = cin.get(); cout.put(c);} x = ST1.insert(s); // s not ( ) + - * / x->attr.type = error;}} return x;} look at the function item<Attributes>* Scanner::get() what is s = c trying to do?

Apr 15th, 2006, 6:00 PM	#8
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Don't get your panties in a wad and don't expect us to be hanging on your thread with bated breath. Leave the monologues to Jay Leno. It assigns the value of c to the string. If c represents a printable character, then that's what you get. You would get 'B' if c were 66 and your system dealt in ASCII. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

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Apr 15th, 2006, 5:20 PM	#5
programmingnoob Hobbyist Programmer Join Date: Feb 2006 Posts: 155 Rep Power: 3	well ... i am still confused

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Programming Forums > Application Development > C++

c++ string ... interesting...