C++ Programming - 3rd Study

May 24, 20157 likes1,711 views

The document contains code examples that demonstrate the use of enums, literals, and strings in C and C++. It shows enums being declared and used in C++98, C++11, and C++14. It also shows different ways of declaring and manipulating strings in C using functions like strcmp(), strcat(), strlen() versus C++ using the std::string class.

int main()
{
enum TrafficLight { Red, Yellow, Green };
enum Job { Warrior, Ranger, Wizard, /* Green */ };
enum Coffee : unsigned char { Latte = 10, Mocha = 25 };
int jobNum = Warrior;
int i = Green + Latte;
if (Yellow == Ranger)
std::cout << "Same!" << std::endl;
else
std::cout << "Different!" << std::endl;
return 0;
}
C / C++98
4

$int main() { enum class TrafficLight { Red, Yellow, Green }; enum class Job { Warrior, Ranger, Wizard, Green }; enum class Coffee : unsigned char { Latte = 10, Mocha = 25 }; Job jobNum = Job::Warrior; int i = static_cast<int>(TrafficLight::Green) + static_cast<int>(Coffee::Latte); // if (TrafficLight::Yellow == Job::Ranger) // … return 0; } C++11 5$

$#include <iostream> int main() { int decimal = 52; int octal = 064; int hexadecimal = 0x34; int binary = 0b110100; // C++14 int maxInt_Cpp98 = 2147483647; int maxInt_Cpp14 = 21'4748'3647; // C++14 return 0; } C++14 8$

http://en.cppreference.com/w/cpp/string/basic_string
10

C
#include <stdio.h>
int main()
{
char str1[30] = "Hello, World";
char* str2 = "Hello, Word";
if (strcmp(str1, str2) == 0) printf("Same!n");
else printf("Different!n");
strcat(str1, str2);
printf("%sn", str1);
printf("%d, %dn", strlen(str1), strlen(str2));
}
11

C++
#include <iostream>
#include <string>
int main()
{
std::string str1 = "Hello, World";
std::string str2 = "Hello, Word";
if (str1 == str2) std::cout << "Same!" << std::endl;
else std::cout << "Different!" << std::endl;
str1 = str1 + str2;
std::cout << str1 << std::endl;
std::cout << str1.size() << ' ' << str2.length() << std::endl;
}
12

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C++ Programming - 3rd Study

3. 3

4. int main() { enum TrafficLight { Red, Yellow, Green }; enum Job { Warrior, Ranger, Wizard, /* Green */ }; enum Coffee : unsigned char { Latte = 10, Mocha = 25 }; int jobNum = Warrior; int i = Green + Latte; if (Yellow == Ranger) std::cout << "Same!" << std::endl; else std::cout << "Different!" << std::endl; return 0; } C / C++98 4

5. int main() { enum class TrafficLight { Red, Yellow, Green }; enum class Job { Warrior, Ranger, Wizard, Green }; enum class Coffee : unsigned char { Latte = 10, Mocha = 25 }; Job jobNum = Job::Warrior; int i = static_cast<int>(TrafficLight::Green) + static_cast<int>(Coffee::Latte); // if (TrafficLight::Yellow == Job::Ranger) // … return 0; } C++11 5

7. 7

8. #include <iostream> int main() { int decimal = 52; int octal = 064; int hexadecimal = 0x34; int binary = 0b110100; // C++14 int maxInt_Cpp98 = 2147483647; int maxInt_Cpp14 = 21'4748'3647; // C++14 return 0; } C++14 8

10. http://en.cppreference.com/w/cpp/string/basic_string 10

11. C #include <stdio.h> int main() { char str1[30] = "Hello, World"; char* str2 = "Hello, Word"; if (strcmp(str1, str2) == 0) printf("Same!n"); else printf("Different!n"); strcat(str1, str2); printf("%sn", str1); printf("%d, %dn", strlen(str1), strlen(str2)); } 11

12. C++ #include <iostream> #include <string> int main() { std::string str1 = "Hello, World"; std::string str2 = "Hello, Word"; if (str1 == str2) std::cout << "Same!" << std::endl; else std::cout << "Different!" << std::endl; str1 = str1 + str2; std::cout << str1 << std::endl; std::cout << str1.size() << ' ' << str2.length() << std::endl; } 12

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