On Sat, 27 Nov 2004 00:14:27 -0500, rganti@xxxxxx wrote > > Hi, Hi Radha, > I am a newbie at using gcc. I wanted to write functions and the main file > in different files > > I am using the following to compile > gcc -c file1.c > gcc -c file2.c > gcc file1.o file2.o > a.out > 2.00000 1.90000 > > I am not able to understand why that is the output. But if write the > function to_print in file1.c and compile, it works normally. > If I replace all floats in both files by double it works > > What is happening? Am I compiling them wrong. When there is no prototype for a function, floats are automatically converted to double when they are transmitted as parameters to this function. So, their size is modified : you can use the operator sizeof to compute the size of each type on your machine. As your function to_print waits for float (4 bytes) and the compiler transmits double (8 bytes), the function to_print actually prints parts of the first variable. Representation of the Stack : What is actually on the stack ------------------------------------------------------------------------ | a | b | ------------------------------------------------------------------------ What to_print expects to find ----------------------------------- | a | b | ----------------------------------- [..Zappé 36 lignes et 449 caractères..] À+ PP -- Groupe Morbihannais d'Utilisateurs de Logiciels Libres http://www.tuxbihan.org GPG fingerprint = 1A4F E154 3D2C A20E E4CA A543 7951 C5C2 E44A A0B5 Patrick Percot.
