im trying program accept x integer ask integer, y. when enter floating point x takes decimal part of input , makes y value. unsure of mistake here.
#include <iostream> #include <string> #include <limits> using namespace std; int getint() { int x = 0; while (!(cin >> x)) { cin.clear(); cin.ignore(numeric_limits<streamsize>::max(), '\n'); cout << "please input proper 'whole' number: " << endl; } return (x); } int toobig() { cout << "your number large, please enter smaller: " << endl; int x = getint(); return (x); } int toosmall() { cout << "your number negative, please enter positive number: " << endl; int x = getint(); return (x); } int main() { cout << "your number please:-" << endl; int x = getint(); if (x>100000) { toobig(); } else if (x<0) { toosmall(); } int y = 0; cout << "enter y " << endl; cin >> y; cout << "x = " << x << endl; cout << "y = " << y << endl; system("pause"); return 0; }
most conversions int stop find can't part of int , few conversion functions tell if stop before parsing whole string.
let's use one of few, shall we?
int getint() { ( ; ; ) // loop until user provides can use. // dangerous. want give after while. { std::string input; // read in string if (std::cin >> input) { char * endp; // updated pointer conversion stopped errno = 0; // convert string int long rval = std::strtol (input.c_str(), &endp, 10); if (*endp == '\0') // check whole string read { if (errno != erange) // check converted number did not overflow long { if (rval >= std::numeric_limits<int>::min() && rval <= std::numeric_limits<int>::max()) // check converted number did not overflow int // replace min , max own passed-in // min , max values if want { return rval; // return known-to-be-good int } } } } else { // note: when cin fails read string, it's over. // time throw exception because // shouldn't happen. std::cin.clear(); // we'll clear error , // enter infinite loop of failure } // failed reason. blow off user input , re-prompt std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); std::cout << "please input proper 'whole' number: " << std::endl; } return 0; // satisfy compiler because non-void function must return. // never reached because of infinite loop. } 
Comments
Post a Comment