#include "stdio.h"
#include "math.h"
void main(){
	long t,i,j,k,x[5],y[5];
	double s1;
	char c;
	long s;
	scanf("%d",&t);
	for(i=1;i<=t;i++){
        s1=0;
		s=0;
		for(j=0;j<5;j++)
			x[j]=y[j]=0;
		scanf("%c",&c);
		while(c==' '||c=='\n')
			scanf("%c",&c);
		j=0;
		while(c!='5'){
			k=j;
			j=(j+1)%5;
			if(c=='1'){
                x[j]=x[k]-1;
				y[j]=y[k]-1;
				s1=s1+(double)(x[k]*y[j]-x[j]*y[k])/2;
				scanf("%c",&c);
				continue;
			}
			if(c=='2'){
                x[j]=x[k];
				y[j]=y[k]-1;
				s1=s1+(double)(x[k]*y[j]-x[j]*y[k])/2;
				scanf("%c",&c);
				continue;
			}
			if(c=='3'){
                x[j]=x[k]+1;
				y[j]=y[k]-1;
				s1=s1+(double)(x[k]*y[j]-x[j]*y[k])/2;
				scanf("%c",&c);
				continue;
			}
			if(c=='4'){
                x[j]=x[k]-1;
				y[j]=y[k];
				s1=s1+(double)(x[k]*y[j]-x[j]*y[k])/2;
				scanf("%c",&c);
				continue;
			}
			if(c=='6'){
                x[j]=x[k]+1;
				y[j]=y[k];
				s1=s1+(double)(x[k]*y[j]-x[j]*y[k])/2;
				scanf("%c",&c);
				continue;
			}
			if(c=='7'){
                x[j]=x[k]-1;
				y[j]=y[k]+1;
				s1=s1+(double)(x[k]*y[j]-x[j]*y[k])/2;
				scanf("%c",&c);
				continue;
			}
			if(c=='8'){
                x[j]=x[k];
				y[j]=y[k]+1;
				s1=s1+(double)(x[k]*y[j]-x[j]*y[k])/2;
				scanf("%c",&c);
				continue;
			}
			if(c=='9'){
                x[j]=x[k]+1;
				y[j]=y[k]+1;
				s1=s1+(double)(x[k]*y[j]-x[j]*y[k])/2;
				scanf("%c",&c);
				continue;
			}
		}
		s=(long)s1;
		if(fabs(s1-s)<0.00001){
			s=abs(s);
			printf("%d\n",s);
		}
		else{
			s1=fabs(s1);
			printf("%.1f\n",s1);
		}
	}
}

• Re:郁闷呀,为什么wa? (1877) 00130004 2004-05-16 10:31:22