Based on http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-087-practical-programming-in-c-january-iap-2010/lecture-notes/
gcc -g -O0 -Wall hello.c -o 1.o
and
gdb 1.o
GNU gdb (GDB) 7.0-ubuntu
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
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<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from ../1.o...done.
(gdb)
(gdb) run
Starting program: ../1.o
hello, 6.087
Program exited normally.
(gdb) quit
Big-endian vs little-endian
#include <stdio.h>
unsigned short x = 1; /* 0x0001 */
int main(void)
{
printf("%s\n", *((unsigned char *) &x) == 0 ? "big-endian" : "little-endian");
return 0;
}
Postfix vs Prefix
Postfix
• y=x++ is a short cut for y=x;x=x+1. x is evaluated before it is
incremented.
• y=x−− is a short cut for y=x;x=x−1. x is evaluated before it is
decremented.
Prefix
• y=++x is a short cut for x=x+1;y=x;. x is evaluate after it is
incremented.
• y=−−x is a short cut for x=x−1;y=x;. x is evaluate after it is
decremented.
