# changing C code into C++

November 25, 2011 at 15:48:58
Specs: Windows 7
 Dear friendsThe following code is correct, but it is written in C, Can anyone help me to change it to C++?Thank you////////////////////////////////////////////////////////#include #include #define pi 3.141593#define A 1.#define qx (0.005*pi)#define qy (0.005*pi)#define F(x) ((*f)(x))#define sqr(x) ((x)*(x))#define no_intv 5000 /* no. of (equal) intervals for the integral */double xsav;double (*nrfunc)();main(){ double ellip2d(),funcn(),funca(),Nq,Aq; Nq=ellip2d(-pi,pi,funcn); Aq=ellip2d(-pi,pi,funca); printf("Nq=%f\n",Nq); printf("Aq=%f\n",Aq); system("pause");}double ellip2d(a,b,func)double a,b;double (*func)();{ double simpson(),f1(); nrfunc=func; return simpson(a,b,f1);}double f1(x)double x;{ double simpson(),f2(); xsav=x; return simpson(-pi,pi,f2);}double f2(y)double y;{ return ((*nrfunc)(xsav,y));}double funcn(x,y)double x,y;{ return x*x+y;}double funca(x,y)double x,y;{ return x*x+y*y;}double simpson(a,b,f)double a,b;double (*f)();/* integrnant = f(x), interval = [a,b], no. of intervals = no_int i=1 -> x=a, i=2 -> x=a+h, ..., i=no_int+1 -> x=b; no_int = even */ { int i; double x,h,sum=0.; if(fabs(b-a)<0.000001) return 0.; h=(b-a)/((float)no_intv); x=a+h; for(i=2;i<=no_intv;i++) { if(i&1) sum+=2.*F(x); /* bitwise definition of odd no. */ else sum+=4.*F(x); x+=h; } return (h*(F(a)+sum+F(b))/3.);}

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#1
November 26, 2011 at 01:05:46
 I can't see anything there that isn't valid C++. Why do you want to change it?

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#2
November 26, 2011 at 02:36:28
 Dear ijack Thank you very much for your reply. This code is valid and there is no problem with it, but I have additional steps which are written in C++ to add them to this code. I will be grateful if could please change it for me from C to C++.Best Wishes

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#3
November 26, 2011 at 02:51:37
 Just add the additional steps. As this code is already valid C++ it should interoperate with the new code without any problems.

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#4
November 26, 2011 at 02:59:08
 Dear ijackThank you for your quick response. I know it is, but I would really change it to C++, I will be really appreciate if could help me with this issue.with all the respect

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#5
November 26, 2011 at 03:27:01
 I really don't know what more you can want. The code is already valid C++, it works, so what do you want changed?I'm beginning to suspect that this is a homework assignment and that you have a requirement to use particular C++ features. I'm afraid that I'm not interested in helping with that.

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#6
November 26, 2011 at 03:33:01
 Thank you very much sir for your help and cooperation

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