c++初学者运用if嵌套语句遇到问题? 。?

Question

谢谢大家明天的ddl┭┮﹏┭┮
题目要求：

代码如下；#include

#include<cmath>
using namespace std;
int main()
{
    double  x,  b, c, t,d, C, B, T;
    char a;
    cout << "输入汽车类型(字母)和入库、出库的时间（h）:" << endl;
    cin >> a >> b >> c;
    
    t = c - b;
    if (a == C)
    {
        if (t <= 3) d = 5 * round(t);
        else d = 15 + 10 * round(t - 3);
    }
    else if (a == B)
    {
        if (t <= 2) d = 10 * round(t);
        else d = 20 + 15 * round(t - 2);
    }
    else(a == T)
    {    if (t <= 1) d = 10 * round(t);
        else d = 10 + 15 * round(t - 1);
    }
    cout << "应缴的停车费：" << d;
return 0;
}

系统报错如下：

Answer 1

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
    double  x,  b, c, t,d, C, B, T;
    char a;
    cout << "输入汽车类型(字母)和入库、出库的时间（h）:" << endl;
    cin >> a >> b >> c;
    
    t = c - b;
    if (a == C)
    {
        if (t <= 3) d = 5 * round(t);
        else d = 15 + 10 * round(t - 3);
    }
    else if (a == B)
    {
        if (t <= 2) d = 10 * round(t);
        else d = 20 + 15 * round(t - 2);
    }
    else if (a == T)
    {    if (t <= 1) d = 10 * round(t);
        else d = 10 + 15 * round(t - 1);
    }
    cout << "应缴的停车费：" << d;
    return 0;
}