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Aug 27th, 2004
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Need help figuring out C++ Pointers

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I am supposed to figure out what the output produced would be from this equation..can anyone help me and explain it to me

char var1='s';
char var2='x';
char *ptr1, *ptr2;
ptr1=&var2;
*ptr2=*ptr1;
cout << *ptr1 << " " < var2 << endl;
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hfick is offline Offline
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Aug 27th, 2004
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Re: Need help figuring out C++ Pointers

Behavior is undefined since ptr2 does not point anywhere.
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Dave Sinkula is offline Offline
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Aug 27th, 2004
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Re: Need help figuring out C++ Pointers

Sorry i missed a line when i typed it in..could you take another look now..

char var1='s';
char var2='x';
char *ptr1, *ptr2;
ptr1=&var1;
ptr2=&var2;
*ptr2=*ptr1;
cout << *ptr1 << " " << var2 << endl;
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hfick is offline Offline
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Aug 27th, 2004
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Re: Need help figuring out C++ Pointers

Did you try compiling it and running it?
Quote ...
s s
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Dave Sinkula is offline Offline
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Re: Need help figuring out C++ Pointers

The code you given has some error, are you sure you are giving the right code?
Anyway, the output should be:

x x

cause ptr1 has been assigned to the address of var2. When you output the value of *ptr1, it will refer to the value of that address.
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hail2dthief is offline Offline
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Aug 27th, 2004
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Re: Need help figuring out C++ Pointers

no..because i don't understand how it works..can you please explain it to me...
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hfick is offline Offline
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Aug 27th, 2004
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Re: Need help figuring out C++ Pointers

i need to know the data types of variables such as:

double var1, *ptr1, *ptr2;
float *ptr3;
int var2, *var4....do you know anything about data types?
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hfick is offline Offline
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Re: Need help figuring out C++ Pointers

Quote originally posted by hail2dthief ...
The code you given has some error, are you sure you are giving the right code?
Anyway, the output should be:

x x

cause ptr1 has been assigned to the address of var2. When you output the value of *ptr1, it will refer to the value of that address.
What are you talking about?
Quote originally posted by hfick ...
i need to know the data types of variables such as:

double var1, *ptr1, *ptr2;
float *ptr3;
int var2, *var4....do you know anything about data types?
???
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Dave Sinkula is offline Offline
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Re: Need help figuring out C++ Pointers

the next question asks says i am supposed to state the data type of each variable...
double var1, *ptr1, *ptr2;
float *ptr3;
int var2, *var4
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hfick is offline Offline
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Re: Need help figuring out C++ Pointers

var1 is a double
ptr1 is a pointer to double
...you should be able to handle it from here.
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Dave Sinkula is offline Offline
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