我在DEV-C++ 4.9.9.2編沒有問題的耶

#include <iostream.h>
#include <stdlib.h>
#include <math.h>
#include <iomanip.h>
main(){
       int a;
       while(cin>>a){
                     if(a==0)break;
                     int k=1;
                     double s[3][a];
                     while(k<=a){
                     cin>>s[1][k]>>s[2][k]>>s[3][k];
                     s[0][k]=( ( pow(s[2][k],2)+pow(s[3][k],2)-pow(s[1][k],2) )/(2*s[2][k]*s[3][k]));
                     s[0][k]=1-( pow(s[0][k],2) );
                     s[0][k]=pow(s[0][k],0.5);
                     s[0][k]=s[1][k]/(2*s[0][k]);
                     s[0][k]=3*( pow(s[0][k],2) );
                     k++;}
                     int m=1;
                     while(m<=a){cout<<fixed<<setprecision(1)<<s[0][m]<<"\n";m++;}
       }
       }