求助：在验证C++Primer第五版中程序时的一些问题，书的15页

按照书上的程序打的，然而运行结果不一样，下面是程序
#include <iostream>
int main()
{
    int currVal = 0,val = 0;
    if (std::cin>>currVal){
        int cnt =1;
        while (std::cin>>val){
            if (val == currVal)
            {
            ++cnt;
            }
            else {
        std::cout<<currVal<<"occurs"
            <<cnt<<"times"<<std::endl;
        currVal = val;
        cnt=1;
    }
        }
        std::cout<<currVal<<"occurs"
            << cnt<<"times"<<std::endl;
    }
    return 0;
}