C++/String/string at
Содержание
Accessing Character Elements of an STL String
#include <string>
#include <iostream>
int main(){
using namespace std;
string str ("Hello String");
for(size_t i = 0; i < str.length(); ++ i){
cout << "Character [" << i << "] is: ";
cout << str [i] << endl;
}
cout << endl;
return 0;
}
Demonstrating member function at
#include <iostream>
using std::cout;
using std::endl;
#include <string>
using std::string;
int main()
{
string string1( "cat" );
string string2;
string string3;
string2 = string1;
string3.assign( string1 );
cout << "string1: " << string1 << "\nstring2: " << string2
<< "\nstring3: " << string3 << "\n\n";
// demonstrating member function at
for ( int i = 0; i < string3.length(); i++ )
cout << string3.at( i );
return 0;
}
/*
string1: cat
string2: cat
string3: cat
cat"
*/
Display the characters in a string one at a time by using the indexing operator
#include <iostream>
#include <string>
using namespace std;
int main()
{
string str1("A");
string str2("B");
string str3("G");
string str4;
cout << " str1: " << str1 << endl;
cout << " str2: " << str2 << endl;
cout << " str3: " << str3 << "\n\n";
for(unsigned i = 0; i < str1.size(); ++i)
cout << "str1[i]: " << str1[i] << endl;
cout << endl;
return 0;
}
Get a C-Style String from a C++ String
#include <cstdio>
#include <string>
using namespace std;
int main( )
{
string boss( "B" );
printf( "%s is an important man.\n\n", boss.c_str() );
char man[50];
strcpy( man, boss.c_str() );
strupr( man );
printf( "this is a test: %s\n", man );
}