16th Week Item 1: Exceptions in the square root

Questions and codes:

/**copyright (c) 2015, College of Computer and Control engineering, Yantai University *all rights reserved.* file name: project.cpp*    Creator: wenqing * Completion Date: June 28, 2015 * Version number: v1.0** Problem Description: Write a program that asks for the square root of the number of inputs. Set exception handling, and use the exception handling mechanism to give hints when entering negative numbers. * Program Input: * Program output: */#include <iostream> #include <cmath>using namespace std;double squareroot (double &a) {    double N;    if (a>=0)        n=sqrt (a);    else        throw A;    return n;} int main () {    double m;    cout<< "Please enter a number to be prescribed:";    The square root of the while (Cin>>m)    {        try        {            cout<<m<<] is "<<squareroot (m) <<endl <<endl;        }        catch (Double)        {            cout<< input number is negative, cannot prescribe! "<<endl<<endl;        }        cout<< "Please enter a number to be prescribed:";    }    return 0;}

Operation Result:

Summary of Knowledge points:

try{    //test content    throw (parameter);} catch (parameter type) {    //EXECUTE statement}

16th Week Item 1: Exceptions in the square root