Printing pointers

[ncode]

I came across printing pointers example on C programming book (C programming for the Absolute Beginner, Second Edition). Unfortunately, the example doesn't work. I typed it correctly and i believe it's the correct code. I just doesn't know it dont work. I tried both C Free and Visual Studio.

#include <stdio.h>

main(){
	
	int x = 1;
	int *Ptr;
	
	iPtr = &x;
	*iPtr = 5;
	
	printf("\n*iPtr = %p\n&x = %p\n", iPtr, &x);
	getchar();
}

Keep saying iPtr is uninitalize ! Thanks

[CommonTater]

Ok... here are the errors I got from Pelles C...

D:\Programming\C_Code\Experiments\junk\main.c(3): warning #2099: Missing type specifier; assuming 'int'.
D:\Programming\C_Code\Experiments\junk\main.c(8): error #2048: Undeclared identifier 'iPtr'.
D:\Programming\C_Code\Experiments\junk\main.c(8): error #2168: Operands of '=' have incompatible types 'int' and 'int *'.
D:\Programming\C_Code\Experiments\junk\main.c(9): error #2144: Type error: pointer expected.
D:\Programming\C_Code\Experiments\junk\main.c(11): warning #2234: Argument 2 to 'printf' does not match the format string; expected 'void *' but found 'int'.
D:\Programming\C_Code\Experiments\junk\main.c(6): warning #2114: Local 'Ptr' is not referenced.

Line 3 ... it's ... int main (void) ...
line 8 ... iPtr is not declared... I think you meant ... Ptr = &x;
line 9 ... again iPtr doesn't exist.
line 11 ... it's that iPtr thing again
Line 6 ... Ptr is declared but never used

And... main() is supposed to return an integer value... so you need something like... return 0; ... before the closing brace.

[ncode]

Ok... here are the errors I got from Pelles C...

D:\Programming\C_Code\Experiments\junk\main.c(3): warning #2099: Missing type specifier; assuming 'int'.
D:\Programming\C_Code\Experiments\junk\main.c(8): error #2048: Undeclared identifier 'iPtr'.
D:\Programming\C_Code\Experiments\junk\main.c(8): error #2168: Operands of '=' have incompatible types 'int' and 'int *'.
D:\Programming\C_Code\Experiments\junk\main.c(9): error #2144: Type error: pointer expected.
D:\Programming\C_Code\Experiments\junk\main.c(11): warning #2234: Argument 2 to 'printf' does not match the format string; expected 'void *' but found 'int'.
D:\Programming\C_Code\Experiments\junk\main.c(6): warning #2114: Local 'Ptr' is not referenced.

Line 3 ... it's ... int main (void) ...
line 8 ... iPtr is not declared... I think you meant ... Ptr = &x;
line 9 ... again iPtr doesn't exist.
line 11 ... it's that iPtr thing again
Line 6 ... Ptr is declared but never used

And... main() is supposed to return an integer value... so you need something like... return 0; ... before the closing brace.

OMG. I have a terrible book

[CommonTater]

OMG. I have a terrible book

Ok... so get a better one... like THIS

Start on page 1... read every word, type up and compile all the examples, do the exercises and quizzes. Play with the code, change it, break it, fix it, learn what does and does not work... turn to the next page... repeat until you get to the end of the book.

FWIW... I'm betting it's a typo on line 6 where it should have been... int *iPtr;

[whiteflags]

Or get any of these books: C Book Recommendations

[ncode]

I borrowed this from my school library. I like this book , because it's simple and easy to understand. Unfortunately, there are some kind of error in it.--------busted

[Tclausex]

Is it just me, or is every C book ever written listed in that thread?