Hi.
I am a new programer in C an C++. Actually, I know some basic things and I am trying to write a program in C++ using one in C. So I would like someone to tell me the meaning of the comand
SIGN(h1,x2-x1);
which I need to replace for one in C++.
Thank you very much!
It seems that SIGN is some kind of macro. Does that your code have line that begins with #define SIGN...?
Gotta love the "please fix this for me, but I'm not going to tell you which functions we're allowed to use" posts.
It's like teaching people to walk by first breaking their legs - muppet teachers! - Salem
Micko,
Thank for your help.
I have not that line in the code. I think I should have it.
So I have found a kind of definition of SIGN in another program which is called from the one I am using:
#define SIGN(a,b) ((b) >= 0.0 ? fabs(a) : -fabs(a))
I will add this line...
I'm glad I helped, but I'm curious about this.
Usually, sign function in math (often labeled as sgn) takes only one argumet and return +1 or -1 depending of sign of the argument. See http://mathworld.wolfram.com/Sign.html
Using name "SIGN" can be misleading...
Gotta love the "please fix this for me, but I'm not going to tell you which functions we're allowed to use" posts.
It's like teaching people to walk by first breaking their legs - muppet teachers! - Salem
I see. It is interesting...
I have to check what my code is doing with this SIGN definition.
Thanks again.
would becomeCode:z=SIGN(h1,x2-x1)
I think, or something silimar!!!Code:if ((x2-x1) >=0) z=fabs(h1) else z=-fabs(h1)
You could pass the program through the preprocessor (without compiling it) and see what SIGN expands to. Eg. the GCC allows you to access the preprocessor as a seperate "cpp" executable.
Code:#include <stdio.h> void J(char*a){int f,i=0,c='1';for(;a[i]!='0';++i)if(i==81){ puts(a);return;}for(;c<='9';++c){for(f=0;f<9;++f)if(a[i-i%27+i%9 /3*3+f/3*9+f%3]==c||a[i%9+f*9]==c||a[i-i%9+f]==c)goto e;a[i]=c;J(a);a[i] ='0';e:;}}int main(int c,char**v){int t=0;if(c>1){for(;v[1][ t];++t);if(t==81){J(v[1]);return 0;}}puts("sudoku [0-9]{81}");return 1;}
