C++ Primer-if语句

统计在输入中每个值连续出现了多少次：

#include <iostream>
int main()
{
    int currval = 0,val = 0;
    if (std::cin >> currval){
        int cnt = 1;
        while (std::cin>>val){
            if (currval == val)
                ++cnt;
            else {
                std::cout<<currval<<" occurs "<<cnt<<" times."<<std::endl;
                currval = val;
                cnt = 1;
            }
        }
            std::cout<<currval<<" occurs "<<cnt<<" times."<<std::endl;
    }
    system("pause");
    return 0;
}

格式：

if (){
    ...
}
else {
    ...
}