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c++ parse int from string 5个
我得到了一个字符串y,其中我确保它只包含数字.在使用stoi函数将其存储在int变量中之前,如何检查它是否超出整数的边界?
我得到了一个字符串y,其中我确保它只包含数字.在使用stoi函数将其存储在int变量中之前,如何检查它是否超出整数的边界?
string y = "2323298347293874928374927392374924" int x = stoi(y); // The program gets aborted when I execute this as it exceeds the bounds // of int. How do I check the bounds before I store it?
解决方法
你可以使用异常处理机制:
#include <stdexcept> std::string y = "2323298347293874928374927392374924" int x; try { x = stoi(y); } catch(std::invalid_argument& e){ // if no conversion could be performed } catch(std::out_of_range& e){ // if the converted value would fall out of the range of the result type // or if the underlying function (std::strtol or std::strtoull) sets errno // to ERANGE. } catch(...) { // everything else }
detailed description of stoi function and how to handle errors