作业：找出一个计算器的论坛

Question

所以我以前用C做过简单的数学程序，但我手头的任务有点复杂，对于我目前的知识。

我需要把这里找到的计算器（计算器：http://ohts.wustl.edu/risk/calculator.html，附录内容包含一下：http://ohts.wustl.edu/risk/formula.html）并将其编程为ObjC程序。我很难弄清楚这个重量/公式。希望能找到正确的方向帮助我如何解决这个问题。

Answer 1

所有的实现仅仅是C，在NSNumber中换行加倍是没有意义的。

#import <Cocoa/Cocoa.h> 

@interface GRE:NSObject 
@end 
@implementation GRE 
+ (NSNumber *) compute:(double) age :(double) iop :(double) cct :(double) vcd :(double) psd 
{ 
     double meanage = 5.64301, betaage = 0.23260; 
     double meaniop = 24.1386, betaiop = 0.09025; 
     double meancct = -14.3349, betacct = 0.71503; 
     double meanpsd = 9.76001, betapsd = 0.12376; 
     double meanvcd = 3.60828, betavcd = 0.17689; 
     double S0_t = 0.91831; 

     double t_cct = -1.0 * (cct/40.0); 
     double t_psd = psd/.2; 
     double t_vcd = vcd/0.1; 

     double agedecade = age/10.0; 
     double xbetamean = (agedecade - meanage) * betaage + 
       (iop - meaniop) * betaiop + 
       (t_cct - meancct) * betacct + 
       (t_psd - meanpsd) * betapsd + 
       (t_vcd - meanvcd) * betavcd; 

     double risk = 1 - pow(S0_t, exp(xbetamean)); 
     return [NSNumber numberWithDouble:risk]; 
} 
@end 
int main() 
{ 
     NSAutoreleasePool * p = [NSAutoreleasePool new]; 

     NSLog(@"Risk: %@", [GRE compute:(55) :(24) :(540): (.40) : (2.2)]); 

     [p release]; 
}