C – Nyheder for rigtige nørder

#1 - arne_v
25. apr. 2024 17:18

Set på LinkedIn (kun lettere omskrevet):


#include <stdio.h>

int main()
{
int arr[] = { 1, 2, 3, 4, 5 };
for(int i = 0; i < 5; i++)
{
printf("%d : %d %d \n", i, arr[i], i[arr]);
}
return 0;
}

Virker fint (testet med GCC).

WTF

#2 - larsp
25. apr. 2024 19:23

Jep. x[y] er essentielt *(x + y), så x og y kan byttes. Det virker fordi pointere generelt incrementeres med deres elementstørrelse, eg:


long long *p = (long long *)100000; // følg ikke denne pointer

printf("%d %d %d", p, p + 1, 2 + p);

char *p2 = (char *)100000; // følg ikke denne pointer

printf("%d %d %d", p2, p2 + 1, 2 + p2);

printer:

100000 100008 100016
100000 100001 100002

... det der er rigtig WTF er at compileren tillader det

#3 - arne_v
25. apr. 2024 23:07

#2

At man kan lave pointer aritmetik i C er både velkendt og udbredt.

At array og pointere er meget ens men ikke helt ens i C er også velkendt.

Men at man kan array indexere en ikke array variabel er lidt overraskende. For mig ihvertfald.

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#27 - sigavij325
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#28 - sigavij325
22. aug. 2026 13:13

#29 - sigavij325
23. aug. 2026 09:46

#30 - sigavij325
24. aug. 2026 06:48

#31 - sigavij325
25. aug. 2026 08:09

#32 - sigavij325
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#33 - sigavij325
30. aug. 2026 11:27

#34 - sigavij325
31. aug. 2026 11:40

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2. sep. 2026 11:30

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#38 - sigavij325
14. sep. 2026 11:34

mboost-dp1

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