题目链接：http://acm.csu.edu.cn/OnlineJudge/problem.php?id=1265
An example of a traditional dice is a rounded cube, with each of its six faces showing a different number of dots from 1 to 6. When thrown or rolled, the dice comes to rest showing on its upper surface a random integral points from one to six, each value being equally likely.
----wikipedia
Now we have two dices which both have six faces. Can you tell us the probability that the sum points of two dices equals S when we thrown?
There is an integer T (1 <= T <= 11) in the first line, means there are T test cases in total.
For each test case, there is only one line with one integer S (2 <= S <= 12), which have the same meaning as above.
For each test case, you should print the probability that the sum points of two dices equals S when we thrown. The answer should be in one line and rounding to 6 decimals.
Print a blank line after each test case.
2
2
3
0.027778
0.055556
代码如下：
#include <cstdio>
int main()
{
int t;
int sum;
scanf("%d",&t);
while(t--)
{
scanf("%d",&sum);
int cont=0;
for(int i = 1; i <= 6; i++)
{
for(int j = 1; j <= 6; j++)
{
if(i+j==sum)
cont++;
}
}
printf("%.6lf\n\n",cont/36.0);
}
return 0;
}原文地址：http://blog.csdn.net/u012860063/article/details/41849711
