循环输入多个数据

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#include <iostream> #include <vector>   int main() {     enum {size = 4};     std::vector<int> num(size);     size_t i=0;       while(std::cin>>num.at(i++)) {         if(i == size) {             for(size_t j=0; j<size; ++j) {                 std::cout<<num.at(j)<<" ";             }             std::cout<<std::endl;             i = 0;         }     }       return 0;  }