算法竞赛入门经典（第二版）3-2分子量UVA1586

#include <cstdio>
int main(){
int n;
scanf("%d", &n);
getchar();
while (n--){
int num = 0;
double mass=0;
double totle = 0;
char str[100];
scanf("%s", str);
int i;
for (i = 0; str[i] != '\0';i++) 
{
if (str[i] > 'A'&&str[i] < 'Z') {
totle +=num>0?mass*num:mass;
mass = str[i] == 'C' ? 12.01 : str[i] == 'H' ? 1.008 : str[i] == 'O' ? 16.00 : 14.01;
num = 0;
}
else if (str[i] >= '0'&&str[i] <= '9'){
num *= 10;
num += str[i] - '0';
}
}
totle += num>0 ? mass*num : mass;
printf("%.3f\n", totle);
}
}

https://vjudge.net/problem/UVA-1586

如有错误，欢迎指正