Can you update this code that it will reject non-numeric input (for inch and cm input) and negative number input.... show that "illegal input"

#include #include char menuSelect(); using namespace std;

int main(int argc,char* argv[]){ double inches; double centimeters; char select; do{ select=menuSelect(); if(select=='E'){ cout<<"Enter number of inches : "; cin>>inches; centimeters=inches*2.54; cout<>centimeters; // reading centimeters from user inches= centimeters/2.54; // converting into inches cout<>selection; selection=toupper(selection); }while(selection!='E' && selection!='M' && selection!='Q'); return selection; }