Thread: new c programmer have problem with pointer....

http://www.exforsys.com/tutorials/c-...-pointers.html

the tutorial above is referred.

i follow the instruction in the tutorial, unfortunately, when i try to compile it, some error was occurred...

Code:

main()
{
int *ptr;
int sum;
sum=45;
ptr=?
printf (“\n Sum is %d\n”, sum);
printf (“\n The sum pointer is %d”, ptr);
}

and this is the error...

Code:

Compiler: Default compiler
Executing  g++.exe...
g++.exe "D:\C\pointer\04.cpp" -o "D:\C\pointer\04.exe"    -I"d:\Dev-Cpp\lib\gcc\mingw32\3.4.2\include"  -I"d:\Dev-Cpp\include\c++\3.4.2\backward"  -I"d:\Dev-Cpp\include\c++\3.4.2\mingw32"  -I"d:\Dev-Cpp\include\c++\3.4.2"  -I"d:\Dev-Cpp\include"   -L"d:\Dev-Cpp\lib" 
Executing  g++.exe...
g++.exe "D:\C\pointer\04.cpp" -o "D:\C\pointer\04.exe"    -I"d:\Dev-Cpp\lib\gcc\mingw32\3.4.2\include"  -I"d:\Dev-Cpp\include\c++\3.4.2\backward"  -I"d:\Dev-Cpp\include\c++\3.4.2\mingw32"  -I"d:\Dev-Cpp\include\c++\3.4.2"  -I"d:\Dev-Cpp\include"   -L"d:\Dev-Cpp\lib" 
D:\C\pointer\04.cpp: In function `int main()':

D:\C\pointer\04.cpp:6: error: expected primary-expression before '?' token
D:\C\pointer\04.cpp:7: error: stray '\147' in program
D:\C\pointer\04.cpp:7: error: stray '\' in program
D:\C\pointer\04.cpp:7: error: `n' undeclared (first use this function)
D:\C\pointer\04.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
D:\C\pointer\04.cpp:7: error: stray '\' in program
D:\C\pointer\04.cpp:7: error: stray '\148' in program
D:\C\pointer\04.cpp:7: error: `printf' undeclared (first use this function)
D:\C\pointer\04.cpp:7: error: expected `:' before ';' token
D:\C\pointer\04.cpp:7: error: expected primary-expression before ';' token
D:\C\pointer\04.cpp:8: error: stray '\147' in program
D:\C\pointer\04.cpp:8: error: stray '\' in program
D:\C\pointer\04.cpp:8: error: stray '\148' in program

Execution terminated

mmm...what was happened..i followed exactly the tutorial, but still have some error...

oic, thank you for ur prompt reply, really appreciate it
so i just modified it...and this time there is no error...but i'm not sure whether it is correct or not....

Code:

#include<stdio.h>

main()
{
  int *ptr;
  int sum;
  sum=45;
  ptr=&sum;
  printf ("Sum is %d\n", sum);
  printf ("The sum pointer is %d\n",ptr);
}

output

Code:

Sum is 45
The sum pointer is 2293616

Code:

#include<stdio.h>

int main()
{
  int *ptr;
  int sum;
  sum=45;
  ptr=&sum;
  printf ("Sum is %d\n", sum);
  printf ("The sum pointer is %p\n",ptr);
  printf ("The sum is %d\n",*ptr);
  return 0;
}

Here is better tutorial than that Pointers. I see some bugs on your tutorial.

ssharish

Originally Posted by ssharish2005

Here is better tutorial than that Pointers. I see some bugs on your tutorial.

ssharish

I am also learning C, and I can tell you from experience it is damn hard to find a decent tuturial that doesn't assume to much, explain too little, or have outright errors. Same problem with VB tutorials I've used.

It seems that you have to combine like 5 different tutorials just to get a decent grasp of what's going on overall.

I'm told that Programming in C by Stephen Koch is suppose to be an incredible, all around easy to understand book on the subject. However, I have not yet bought a copy so I don't know whether it is or isn't for myself.

I am also learning C, and I can tell you from experience it is damn hard to find a decent tuturial that doesn't assume to much, explain too little, or have outright errors. Same problem with VB tutorials I've used.

The reason I gave him a better link is because the old link which he was refereeing wasn't the start link for pointer. It confuses any beginner es. Even some of the example code dosn;t work in that page. Which is like no point looking into that site anymore.

Pointer are not those topic that would be understandable at a glance, you should got thought it twice or more to clearly understand whats going on behind the senses.

ssharish