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What is your favorite C programming trick? [closed]
...
C99 offers some really cool stuff using anonymous arrays:
Removing pointless variables
{
int yes=1;
setsockopt(yourSocket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
}
becomes
setsockopt(yourSocket, SOL_SOC...
Casting a variable using a Type variable
...andling an actual type. With proper interfaces that shouldn't be necessary 99.9% of the times. There are perhaps a few edge cases when it comes to reflection that it might make sense, but I would recommend to avoid those cases.
Edit 2:
Few extra tips:
Try to keep your code as type-safe as possib...
SQL to find the number of distinct values in a column
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Paul JamesPaul James
1,81311 gold badge99 silver badges22 bronze badges
60
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Why does the C preprocessor interpret the word “linux” as the constant “1”?
...line options:
gcc -std=c90 -pedantic ... # or -std=c89 or -ansi
gcc -std=c99 -pedantic
gcc -std=c11 -pedantic
See the gcc manual for more details.
gcc will be phasing out these definitions in future releases, so you shouldn't write code that depends on them. If your program needs to know whether...
DataTable: Hide the Show Entries dropdown but keep the Search box
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Peter Hall
30.5k99 gold badges6565 silver badges128128 bronze badges
answered Jun 27 '17 at 11:06
NivNiv
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What's the difference between “mod” and “remainder”?
...1, or -3 with remainder 1, the implementation just had to document which. C99 removed the flexibility, so now -5 / 2 is always -2.
– Steve Jessop
Dec 3 '12 at 13:23
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How can I get a count of the total number of digits in a number?
...ast to double) causes a computation error when the input value is exactly -999999999999999999: the LOG10 method returns 20 instead of 19. The LOG10 method also must have a if guard for the case when the input value is zero.
The LOG10 method is quite tricky to get working for all values, which means...
Difference between a Structure and a Union
...
union foo x;
x.a = 3;
x.b = 'c';
printf("%i, %i\n", x.a, x.b);
prints
99, 99
Why are the two values the same? Because the last 3 bytes of the int 3 are all zero, so it's also read as 99. If we put in a larger number for x.a, you'll see that this is not always the case:
union foo x;
x.a = 387...
C char array initialization
...e for main() (and you should also use void, i.e., int main(void) { ... }. C99 got rid of this rule, so this code will not compile for C99 and later. The other thing to note here is that starting with C99, if you omit return in main, there is an automatic return 0; placed/implied before the } at main...