What-is-the-size-of-a-pointer-in-C? tccicomputercoaching.com

WHAT-IS-THE-SIZE-OFA-POINTER-IN-C? tccicomputercoaching.co m

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TCCICOMPUTERCOACHING.COM  The size of a pointer depends on many factors - including the CPU architecture, compiler, Operating System etc.  It depends on which compiler you are using.  If you are using 16 bit it will be 2.  If you are using 32 bit it will be 4.  If you are using 64 bit it will be 8.  It is common to all the data types (*int,*char,*flaot, etc…).

TCCICOMPUTERCOACHING.COM #include <stdio.h> int main() { int *ip; printf(“pointer size: %zu\n”, sizeof(ip)); } > cc -o pointersize pointersize.c > ./pointersize pointer size: 8 > cc -m32 -o pointersize pointersize.c > ./pointersize pointer size: 4

TCCICOMPUTERCOACHING.COM  Pointer size depends only on the model under which you are compiling your code. Not on the operating system. So I do have a 64bit Linux, but if I force gcc to compile 32bit code, I get 32bit ELF and i386 code with just 4 bytes pointer size.  But also on modern computers you can have different pointer sizes.  A modern 64 bit Intel/AMD PC still runs 8086 programs with 16/20/32 bit pointer sizes.

TCCICOMPUTERCOACHING.COM ď&#x201A;Ą Even with modern programming tools it can have different pointer sizes. Many programs still basically are written for 32 bit OS'es, which typically can be run without any problems on a 64 bit OS. ď&#x201A;Ą This is most useful concept Pointer in C Programming Language.

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