Posts by Lundin‭

For the sake of code golf, you first need to decide if you wish to compete in strictly conforming ("real") C, in which case you can't rely on non-standard extensions, poorly-defined behavior or obs...

posted 5y ago by Lundin‭

C (gcc), 20 bytes f(a){puts("!"+a%2);} Try it online! Function solution. Prints ! in case of even numbers, otherwise just new line.

posted 5y ago by Lundin‭  ·  edited 5y ago by Lundin‭

Background The normal "FizzBuzz" task is to create an up-counting loop which prints "Fizz" in case the count is divisible by 3 or "Buzz" in case the count is divisible by 5. Consequently, "FizzBuz...

posted 5y ago by Lundin‭  ·  edited 5y ago by Lundin‭

For this to work, I think we need to rule out all start-up code (the C runtime) but also the register maps. So I think answers should be a void main (void){ ... } (or equivalent) function solution ...

posted 5y ago by Lundin‭  ·  edited 5y ago by Lundin‭

C (gcc), 153 bytes a,b;f(char*s){for(char*c,*o="idso";*s;s++)for(c=o;*c;c++)*s==*c&&(b=c-o,a+=!b,a-=b==1,b==2?a*=a:0,b==3&&printf("%d%c",a,s[1]?44:10),a==-1|a==256?a=0:0);} Tr...

posted 5y ago by Lundin‭  ·  edited 5y ago by Lundin‭

C (compliant), 106 bytes char r,i,s[80];void f(int n){memset(s,32,79);for(;r<n;puts(s),r++)for(i=0;i++<n*2;s[n-r-1]=47,s[n+r]=92);} Try it online! Standard C compliant function solutio...

posted 5y ago by Lundin‭

C (compliant), 19 bytes (gcc -std=c18 -pedantic-errors) int main(){main();} Godbolt

posted 6y ago by Lundin‭  ·  edited 6y ago by Lundin‭

C (gcc), 45, 42 bytes t[9999];f(s,a)int*a;{for(;s;)t[a[--s]]++;} Try it online! Assumptions: Passing the array size to a function can be used as a means to deal with empty arrays (not s...

posted 4y ago by Lundin‭  ·  edited 4y ago by Lundin‭

C (gcc), 358 bytes static inline _Noreturn float f(union u);extern _Thread_local _Complex long double*restrict B;main(void){_Atomic register enum {A};typedef _Alignas(unsigned char)struct S;_Sta...

posted 4y ago by Lundin‭  ·  edited 3y ago by Lundin‭

Lets get a bit closer to the metal than usual! The task is to pass a constant value between the different data memory sections of a typical computer. For this challenge you need a system and langu...

posted 5y ago by Lundin‭

The C (gcc) implies extensions - it will only work with that specific compiler under it's default setting GNU17 (equivalent to -std=gnu17), which is mostly a superset of standard C. This also inclu...

posted 5y ago by Lundin‭

If you actually use the library, sure, I guess. How you are going to get it running on online compilers, I have no idea. It's very uninteresting for others to view some code using a custom library ...

posted 5y ago by Lundin‭  ·  edited 2y ago by Timwi‭

C (gcc), 126 129 bytes N=9999;f(n){int p[N],i,j,P;memset(p,1,N);for(i=P=2;i*i<N;i++)if(p[i]){for(j=i*i;j<N;j+=i)p[j]=0;i-P>=n?j=N:(P=i);}e:return P;} Try it online! This is an integer...

posted 6y ago by Lundin‭  ·  edited 6y ago by Lundin‭

I was thinking the same thing. Maybe instead there should be one category for code golf and leave the main Q&A is for other types of challenges and puzzles?

posted 6y ago by Lundin‭

Function parameters should not be allowed to be used in place of a return value. Reasons: Terms like return value and function result are explicitly specified as a specific, formal language i...

posted 4y ago by Lundin‭