Yet another fun C-puzzle
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Can we print more than 100? Does the program have to terminate elegantly? I came up with a quick solution but it ain't exactly pretty :D cheers, Chris Maunder
Chris Maunder wrote: Can we print more than 100? Does the program have to terminate elegantly? I came up with a quick solution but it ain't exactly pretty :-D
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Mine was pretty similar except it doesn't use globals and uses a double-not rather than / 100 :)
#include <stdlib.h>
#include <stdio.h>typedef void (*funcptr)(int);
funcptr buf[2];
void count(int num)
{
printf("%d\n", 100-num);
(*buf[!!num])(num-1);
}int main()
{
buf[0] = exit;
buf[1] = count;
count(99);
}Ryan
"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
*Applause* The double not was pretty cool - more elegant than Russel's division - and a lot more neater than my comparision operator :-) Nish
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*Applause* The double not was pretty cool - more elegant than Russel's division - and a lot more neater than my comparision operator :-) Nish
Ryan Russel still wins though - 1) he posted it first 2) he uses division which while inelegant is not a conditional expression, your double not (while elegant) is still a conditional expression (valid as the question only disallows conditional statements and expressions are not statements) Nish
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This question was asked in the Trivandrum Microsoft UG forums :- Using C, print 1-100 without using any loop or conditional statements? An answer was later posted in C++ (and the poster said that it was not possible without C++). Here's his C++ solution :-
static int i=0;
class ad
{
ad()
{
i++;
cout << i;
}
}void main()
{
ad objad[100];
}I spent a part of my Sunday evening wondering if it was possible in some alternative manner and found a solution. It shouldn't take you more than 15-20 minutes to think of it (assuming you haven't done this before). Let's see who gets there first (remember - no C++, no classes). Nish :-)
How about this
int main(int ac, char ** av) { static int i=1; printf("%d ",i++); i%101&&main(0,0); } -
How about this
int main(int ac, char ** av) { static int i=1; printf("%d ",i++); i%101&&main(0,0); }Cool stuff, Vivek :-) Nish
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Cool stuff, Vivek :-) Nish
Here's an improvement (LOC reduced anyway)
int main(int ac, char ** av)
{
printf("%d ",101-ac,(ac%100)&&main(ac+1,0));
}Run the app without arguments (first time ac will be 1) Nish
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BTW 100
printfs don't count :rolleyes: -
This question was asked in the Trivandrum Microsoft UG forums :- Using C, print 1-100 without using any loop or conditional statements? An answer was later posted in C++ (and the poster said that it was not possible without C++). Here's his C++ solution :-
static int i=0;
class ad
{
ad()
{
i++;
cout << i;
}
}void main()
{
ad objad[100];
}I spent a part of my Sunday evening wondering if it was possible in some alternative manner and found a solution. It shouldn't take you more than 15-20 minutes to think of it (assuming you haven't done this before). Let's see who gets there first (remember - no C++, no classes). Nish :-)
template <long val> void printfn() { std::cout << val << "\n"; printfn<val + 1>(); } template <> void printfn<100L>() { std::cout << "100\n"; } int main(int argc, char* argv[]) { printfn<1L>(); system("PAUSE"); return 0; }this works fine in VS.NET 2003 and gcc, but not with VC++ 6.0 which generates wrong specialization. i suppose that it also faster then previous solutions, since it is resolved in compile time. -
template <long val> void printfn() { std::cout << val << "\n"; printfn<val + 1>(); } template <> void printfn<100L>() { std::cout << "100\n"; } int main(int argc, char* argv[]) { printfn<1L>(); system("PAUSE"); return 0; }this works fine in VS.NET 2003 and gcc, but not with VC++ 6.0 which generates wrong specialization. i suppose that it also faster then previous solutions, since it is resolved in compile time.Good code, but C does not support templates :-) Nish
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Good code, but C does not support templates :-) Nish
:-O i got carried away by this line from your original post: "An answer was later posted in C++ (and the poster said that it was not possible without C++)."
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This question was asked in the Trivandrum Microsoft UG forums :- Using C, print 1-100 without using any loop or conditional statements? An answer was later posted in C++ (and the poster said that it was not possible without C++). Here's his C++ solution :-
static int i=0;
class ad
{
ad()
{
i++;
cout << i;
}
}void main()
{
ad objad[100];
}I spent a part of my Sunday evening wondering if it was possible in some alternative manner and found a solution. It shouldn't take you more than 15-20 minutes to think of it (assuming you haven't done this before). Let's see who gets there first (remember - no C++, no classes). Nish :-)
assuming that if also doesnt matter n yeah also mind that i m writing code directly here, neither compiled nor checked for output -
int main(int x) { printf("%d",x); if(x<100) main(++x); }program is expected to run from command prompt as filename 0 what do u think?? UTSAV MCA final yr -
This question was asked in the Trivandrum Microsoft UG forums :- Using C, print 1-100 without using any loop or conditional statements? An answer was later posted in C++ (and the poster said that it was not possible without C++). Here's his C++ solution :-
static int i=0;
class ad
{
ad()
{
i++;
cout << i;
}
}void main()
{
ad objad[100];
}I spent a part of my Sunday evening wondering if it was possible in some alternative manner and found a solution. It shouldn't take you more than 15-20 minutes to think of it (assuming you haven't done this before). Let's see who gets there first (remember - no C++, no classes). Nish :-)
Does this count? void main(){ char buffer[8] strcpy(buffer,"1-100"); cout << buffer << endl; } Jason
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assuming that if also doesnt matter n yeah also mind that i m writing code directly here, neither compiled nor checked for output -
int main(int x) { printf("%d",x); if(x<100) main(++x); }program is expected to run from command prompt as filename 0 what do u think?? UTSAV MCA final yrifis a conditional statement - not allowed. -
BTW 100
printfs don't count :rolleyes:Does one
printfwith 100 numbers count? :) sorry if this question was already asked, I didn't look at other posts... David Never forget: "Stay kul and happy" (I.A.)
David's thoughts / dnhsoftware.org / MyHTMLTidy -
assuming that if also doesnt matter n yeah also mind that i m writing code directly here, neither compiled nor checked for output -
int main(int x) { printf("%d",x); if(x<100) main(++x); }program is expected to run from command prompt as filename 0 what do u think?? UTSAV MCA final yrutsav_verma wrote: int main(int x) { printf("%d",x); if(x<100) main(++x); } program is expected to run from command prompt as filename 0 what do u think?? In addition to "if" being conditional (and therefore you break the rules), there are other bugs in your code. The first argument to main is the number of arguments and if you invoke the prog as "filename 0" as you say, this will be equal to 2 (including the file name). Thus your prog starts printing from 2. 2nd issue is that main should ideally take 2 arguments (though most compilers will let your code compile).
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Does this count? void main(){ char buffer[8] strcpy(buffer,"1-100"); cout << buffer << endl; } Jason
Jason Pease wrote: Does this count? void main(){ char buffer[8] strcpy(buffer,"1-100"); cout << buffer << endl; } :rolleyes:
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This question was asked in the Trivandrum Microsoft UG forums :- Using C, print 1-100 without using any loop or conditional statements? An answer was later posted in C++ (and the poster said that it was not possible without C++). Here's his C++ solution :-
static int i=0;
class ad
{
ad()
{
i++;
cout << i;
}
}void main()
{
ad objad[100];
}I spent a part of my Sunday evening wondering if it was possible in some alternative manner and found a solution. It shouldn't take you more than 15-20 minutes to think of it (assuming you haven't done this before). Let's see who gets there first (remember - no C++, no classes). Nish :-)
#define max 100 static int i = 1; bool Print() { print(i++); return ((max - i) && Print()) }
Since we cant use iterative approarch (loops) let's make it recursive. We can't use condition statement (if) so let's use short-circuit expression :) yeah quite late but I had to go visit lectures :( I've solved it on the way there :) David Never forget: "Stay kul and happy" (I.A.)
David's thoughts / dnhsoftware.org / MyHTMLTidy -
#define max 100 static int i = 1; bool Print() { print(i++); return ((max - i) && Print()) }
Since we cant use iterative approarch (loops) let's make it recursive. We can't use condition statement (if) so let's use short-circuit expression :) yeah quite late but I had to go visit lectures :( I've solved it on the way there :) David Never forget: "Stay kul and happy" (I.A.)
David's thoughts / dnhsoftware.org / MyHTMLTidyWell thank you wery much David for enlightening me with your approach to the problem!!! - Finally I've got it what the last line (like in Vivek Ryan's code, for example) actually does! I persume, now, that C doesn't run/check the second argument of AND(&&) when the first is already evaluated as "bogus". Nice trick, must say! MY GREETINGS TO ALL by mladjan
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Here's an improvement (LOC reduced anyway)
int main(int ac, char ** av)
{
printf("%d ",101-ac,(ac%100)&&main(ac+1,0));
}Run the app without arguments (first time ac will be 1) Nish