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C++ Programing
// Namespace declaration
namespace my_namespace {
int x; // variable
void func(); // function
class MyClass { /* class definition */ }; // class
}
// Accessing elements in the namespace
int main() {
my_namespace::x = 42; // Accessing the variable x from the namespace
my_namespace::func(); // Calling the function func() from the namespace
my_namespace::MyClass obj; // Creating an object of the class MyClass from the namespace
// ...
return 0;
}
By using namespaces, you can create more modular and organized code, making it easier to manage and maintain larger projects.
namespace math_operations {
int add(int a, int b) {
return a + b;
}
}
namespace string_operations {
std::string concat(const std::string& str1, const std::string& str2) {
return str1 + str2;
}
}
int main() {
int result = math_operations::add(5, 3); // Using the add function from the math_operations namespace
std::string combined = string_operations::concat("Hello", " World!"); // Using the concat function from the string_operations namespace
return 0;
}
By using namespaces, you can create cleaner and more organized code, minimize naming conflicts, and make it easier to collaborate with other developers.
// Part 1 of the program
#include
void calculate() {
std::cout << "Calculating in Part 1" << std::endl;
}
// Part 2 of the program
#include
void calculate() {
std::cout << "Calculating in Part 2" << std::endl;
}
int main() {
calculate(); // Which "calculate" function should be called?
return 0;
}
However, using namespaces, you can avoid the conflict:
// Part 1 of the program
#include
namespace part1 {
void calculate() {
std::cout << "Calculating in Part 1" << std::endl;
}
}
// Part 2 of the program
#include
namespace part2 {
void calculate() {
std::cout << "Calculating in Part 2" << std::endl;
}
}
int main() {
part1::calculate(); // Calls the "calculate" function from Part 1
part2::calculate(); // Calls the "calculate" function from Part 2
return 0;
}
By using namespaces, you can clearly specify which “calculate” function you want to use, resolving any ambiguity and avoiding name collisions between identifiers in different parts of your program.
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