额，好吧……
分先给了先，不过想问一下，10楼你输出的结果是什么？

0.000025

搞混了，结果该是：
7
3
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
FTFTTTTTTFTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
TTTTTTTTTFTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
not

上回给你的代码有点小错误：
这个循环该如下这样写：
for(i=0;i<long_num;i++)
    {
        if((long_str[i]>='A')&&(long_str[i]<='Z'))
        {
            num[long_str[i]-'A']='T';   
        }
    }