Hello world in C and seeing what it is actually doing
One of the most simple C applications, how to compile it and how to objdump it.
C
#include
int main()
{
int i;
for(i=0;i < 10; i++)
{
puts("Hello Mac\n");
}
return 0;
}This will return the string Hello Mac 10 times.
lets compile and run it
gcc firstprog.c
ls -l
./a.out
now see what its really doing
objdump -D a.out | grep -A20 main.:
Random Fact about 32 vs 64 bit processors.
32-bit processors have 232 (or 4,294,967,296) possible addresses
64-bit ones have 264 (1.84467441 x 1019) possible addresses
Each byte is shown in hexadecimal notation which is a base 16 numbering system, rather than the normal system we are used to which is base-10. Hex uses 0 - 9 and also A - F for 10 - 15.
Show what it would look like with intel formatting
objdump -M intel -D a.out | grep -A20 main.:
Note this will throw an error on arm based mac's, for obvious reasons.
objdump: error: 'a.out': Unrecognized disassembler option: intel
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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."
I just checked google books for BFG, and the dedication is there.
https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1
Roald Dahl, 1986
