c++ - 如何在 if-else 语句中声明变量？

Question

我还是新手，很多东西都不懂唯一缺少的是 x=d/t，我不知道该把它放在哪里......我已经尝试了各种方法，但仍然无法弄清楚该把它放在哪里。

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{


     int d, t, s, z;
     cout<<"Enter the distance of your destination:"<<endl;
     cin >>d;
     cout<<"Enter the time you want to get there:"<<endl;
     cin >>t;

     for (z=1; z<=5; z++)
     {
      cout<<"Enter your speed:"<<endl;
      cin>>s;

      if (int x=d/t && x>=s)
      { 

              cout<<"Maintain your speed it is the appopriate speed: "<<s<<"mph"<<endl;
              break;
              }
              else 
              {

              cout<<"Go faster at this rate you won't get to your destination on time"<<endl;
              }
              }
    system("PAUSE");
    return EXIT_SUCCESS;
}

The Output always shows the if statement even though it should already show the else statement.. 
I really need help on this..

Answer 1

只要把它放在if

之外

int x = d / t;
if (x && x >= s)

或者你可能想要这个

int x = d / t;
if (x >= s)