Pointer Assignment

cardinals03 · 10-22-2009, 12:09 PM

Hey guys, I have a question as to whether or not I am assigning the following correctly.

The question states:
Assume the declaration

Code:

int m = 35, *intPtr;
double x, *dblPtr;

a) Assign intPtr a value so it points to m
b) Assign dblPtr a value so it points to x, amd then use the pointer to assign x the value of 5.3

On (a), I think it is:

Code:

intPtr = &m;

On (b), I think it is:

Code:

dblPtr = &x;
*dblPtr = 5.3;

I am questioning myself as to whether I should have used the * operator in assigning the first statements (for instance, *intPtr = &m and *dblPtr = 5.3)

I think I am right on the first set. Can someone please let me know? Thanks

**laserlight** · 10-22-2009, 12:14 PM

What you have now is correct. Still, you could change it to what you were considering, compile, and observe what you get.

Daved · 10-22-2009, 12:16 PM

Your code looks right as is.

Look at the two statements for dblPtr. One assigns an address, the other assigns a value. The pointer itself holds an address, which is why you assign directly to dblPtr. But the value should be assigned to the dereferenced pointer, which is why you added the * for the second one.

10-22-2009, 12:09 PM	#1
cardinals03 Registered User Join Date: Oct 2009 Posts: 10	Pointer Assignment Hey guys, I have a question as to whether or not I am assigning the following correctly. The question states: Assume the declaration Code: int m = 35, intPtr; double x, dblPtr; a) Assign intPtr a value so it points to m b) Assign dblPtr a value so it points to x, amd then use the pointer to assign x the value of 5.3 On (a), I think it is: Code: intPtr = &m; On (b), I think it is: Code: dblPtr = &x; dblPtr = 5.3; I am questioning myself as to whether I should have used the operator in assigning the first statements (for instance, intPtr = &m and dblPtr = 5.3) I think I am right on the first set. Can someone please let me know? Thanks
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10-22-2009, 12:14 PM	#2
laserlight C++ Witch Join Date: Oct 2003 Location: Singapore Posts: 11,263	What you have now is correct. Still, you could change it to what you were considering, compile, and observe what you get. __________________ C + C++ Compiler: MinGW port of GCC Build + Version Control System: SCons + Bazaar Look up a C/C++ Reference and learn How To Ask Questions The Smart Way
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10-22-2009, 12:16 PM	#3
Daved Registered User Join Date: Jan 2005 Posts: 7,246	Your code looks right as is. Look at the two statements for dblPtr. One assigns an address, the other assigns a value. The pointer itself holds an address, which is why you assign directly to dblPtr. But the value should be assigned to the dereferenced pointer, which is why you added the * for the second one.
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