Created
September 17, 2015 14:36
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Parse zero-padded number
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#include <iostream> | |
#include <string> | |
#include <stdexcept> | |
int main(int, char *[]) | |
{ | |
using std::string; | |
using std::cin; | |
using std::cout; | |
using std::endl; | |
using std::runtime_error; | |
string input_num; | |
int converted_num = 0; | |
cout << "Enter 4 char number..." << endl; | |
cin >> input_num; | |
try { | |
if(input_num.size() != 4) { | |
throw runtime_error("Input must be 4 characters long!"); | |
} | |
for(auto &&c : input_num) { | |
auto i = c - '0'; | |
if(i < 0 || i > 9) { | |
throw runtime_error("Input must contain numbers only!"); | |
} | |
converted_num = (converted_num * 10) + i; | |
} | |
cout << "Result: " << converted_num << endl; | |
} | |
catch(runtime_error &e) { | |
cout << e.what() << endl; | |
} | |
return 0; | |
} |
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