C++: معالجة النصوص المتقدمة

string.erase(startPos, deleteCount);

(program output)

#include <iostream>
#include <string>

int main() {
 std::string text = "Hello, World!";
 
 // حذف 7 محارف بدءاً من الموضع 5 (", World")
 text.erase(5, 7);
 
 std::cout << text << std::endl; // Hello!
 
 return 0;
}

string.insert(insertion position, string to insert);

#include <iostream>
#include <string>

int main() {
 std::string text = "Hello!";
 
 // إدراج " World" قبل المحرف الخامس
 text.insert(5, " World");
 
 std::cout << text << std::endl; // Hello World!
 
 return 0;
}

#include <iostream>
#include <string>

int main() {
 std::string text = "Hello";
 text.clear(); // تفريغ النص
 
 std::cout << "Length: " << text.length() << std::endl; // 0
 std::cout << "Is empty: " << text.empty() << std::endl; // 1 (true)
 
 return 0;
}

#include <iostream>
#include <string>

int main() {
 std::string s1 = "apple";
 std::string s2 = "banana";
 
 int result = s1.compare(s2);
 
 if (result == 0) {
 std::cout << "s1 equals s2" << std::endl;
 } else if (result < 0) {
 std::cout << "s1 is less than s2" << std::endl; // يُنفذ هذا السطر
 } else {
 std::cout << "s1 is greater than s2" << std::endl;
 }
 
 return 0;
}

#include <iostream>
#include <string>

int main() {
 int age = 25;
 double price = 19.99;
 
 std::string ageStr = std::to_string(age);
 std::string priceStr = std::to_string(price);
 
 std::cout << "Age: " << ageStr << std::endl;
 std::cout << "Price: " << priceStr << std::endl;
 
 return 0;
}

#include <iostream>
#include <string>

int main() {
 std::string numStr = "123";
 std::string priceStr = "19.99";
 
 int num = std::stoi(numStr);
 double price = std::stod(priceStr);
 
 std::cout << "num = " << num << std::endl;
 std::cout << "price = " << price << std::endl;
 
 return 0;
}

#include <iostream>
#include <string>

int main() {
 std::string text = "Hello";
 
 for (size_t i = 0; i < text.length(); i++) {
 std::cout << text[i] << " ";
 }
 std::cout << std::endl;
 
 return 0;
}

#include <iostream>
#include <string>

int main() {
 std::string text = "Hello";
 
 for (char c : text) {
 std::cout << c << " ";
 }
 std::cout << std::endl;
 
 return 0;
}

#include <iostream>
#include <string>

int main() {
 std::string text = "I like C. C is powerful.";
 std::string oldStr = "C";
 std::string newStr = "C++";
 
 size_t pos = 0;
 while ((pos = text.find(oldStr, pos)) != std::string::npos) {
 text.replace(pos, oldStr.length(), newStr);
 pos += newStr.length(); // تجنب الحلقة اللانهائية
 }
 
 std::cout << "After replacement: " << text << std::endl;
 
 return 0;
}

After replacement: 

#include <iostream>
#include <string>

int main() {
    std::string text = "Hello, C++ World!";

    // استخراج "Hello"
    std::string part1 = text.substr(0, 5);
    std::cout << "part1: " << part1 << std::endl;

    // استخراج "C++"
    std::string part2 = text.substr(7, 3);
    std::cout << "part2: " << part2 << std::endl;

    // استخراج من الموضع 7 حتى النهاية
    std::string part3 = text.substr(7);
    std::cout << "part3: " << part3 << std::endl;

    return 0;
}

part1: 
part2: 
part3: 

Input: Hello World, this is C++!
Output: HelloWorld,thisisC++!