fig10.01.cpp

#include<iostream>#include<string>using namespace std;int main(){string s1("happy");string s2("birthday");string s3;cout << "s1 is \"" << s1 << "\"; s2 is \"" << s2<< "\"; s3 is \""<< s3 <<'\"'<< "\n\nThe results of comparing s2 and s1:"<< "\ns2 == s1 yields " << (s2 == s1 ? "true" : "faulse")<< "\ns2 != s1 yields " << (s2 != s1 ? "true" : "faulse")<< "\ns2 > s1 yields " << (s2 > s1 ? "true" : "faulse")<< "\ns2 < s1 yields " << (s2 < s1 ? "true" : "faulse")<< "\ns2 >= s1 yields " << (s2 >= s1 ? "true" : "faulse")<< "\ns2 <= s1 yields " << (s2 <= s1 ? "true" : "faulse");cout << "\n\nTesting s3.empty():" << endl;if (s3.empty()){cout << "s3 is empty;assigned s1 to s3;" << endl;s3 = s1;cout << "s3 is \"" << s3 << "\"";}cout << "\n\ns1 += s2 yields s1 = ";s1 += s2;cout << s1;cout << "\n\ns1 += \" to you\" yields" << endl;s1 += "to you";cout << "s1 = " << s1 << "\n\n";cout << "The substring of s1 starting ati location 0 for\n"<< "14 characters, s1.substr(0,14), is :\n"<< s1.substr(0, 14) << "\n\n";cout << "The substring of s1 starting at\n"<< "location 15, s1.substr(15), is:\n"<< s1.substr(15) << endl;string s4(s1);cout << "\ns4 = " << s4 << "\n\n";cout << "assigning s4 to s4" << endl;s4 = s4;cout << "s4 = " << s4 << endl;s1[0] = 'H';s1[6] = 'B';cout << "\ns1 after s1[0] = 'H' and s1[6]= 'B' is: "<< s1 << "\n\n";try{cout << "Attempt to assign 'd' to s1.at(30) yields:" << endl;s1.at(30) = 'd';}catch (out_of_range &ex){cout << "An exception occurred: " << ex.what() << endl;}}