poj 2713 Tire Dimensions

#include<stdio.h>#include<ctype.h>char tmp[99];int main(){    while(gets(tmp)){        if(!tmp[0])continue;        double a[3],*val=a;        for(char*p=tmp;;){ while(*p&&!isdigit(*p)&&*p!='.')++p; if(!*p)break; int n; sscanf(p,"%lf%n",val++,&n); p+=n;        }        double t=a[0]*a[1]/500+a[2]*2.54;        printf("%s: %.0fn",tmp,t*3.1415926535897932);    }}