C++ Strings
In C++, strings are objects of the std::string class that store text. They provide many built-in functions.
C++ में strings, std::string class के objects होते हैं जो text store करते हैं। इनमें कई built-in functions होते हैं।
Example 1: Declare and Print String
#include <iostream>
#include <string>
int main() {
std::string str = "Hello, World!";
std::cout << str;
return 0;
}Output: Hello, World!
Prints the string using std::cout.
std::cout का use करके string print करता है।
Example 2: Get String Length
#include <iostream>
#include <string>
int main() {
std::string str = "Hello";
std::cout << "Length = " << str.length();
return 0;
}Output: Length = 5
Uses length() method to get string length.
length() method से string की length निकालता है।
Example 3: Copy String
#include <iostream>
#include <string>
int main() {
std::string src = "Login Technologies";
std::string dest = src;
std::cout << dest;
return 0;
}Output: Login Technologies
Copies one string to another using assignment.
assignment operator से string copy करता है।
Example 4: Concatenate Strings
#include <iostream>
#include <string>
int main() {
std::string str1 = "Hello ";
std::string str2 = "World!";
std::string result = str1 + str2;
std::cout << result;
return 0;
}Output: Hello World!
Concatenates two strings using + operator.
+ operator से दो strings जोड़ता है।
Example 5: Compare Strings
#include <iostream>
#include <string>
int main() {
std::string str1 = "apple";
std::string str2 = "apple";
if(str1 == str2)
std::cout << "Strings are equal";
else
std::cout << "Strings are not equal";
return 0;
}Output: Strings are equal
Checks if strings are equal with == operator.
== operator से strings की equality चेक करता है।
Example 6: Get Input String with Spaces
#include <iostream>
#include <string>
int main() {
std::string str;
std::cout << "Enter a line: ";
std::getline(std::cin, str);
std::cout << "You entered: " << str;
return 0;
}Output: (User input shown)
Uses getline() to read a line with spaces.
getline() से space सहित पूरी line लेता है।
Example 7: Access Characters in String
#include <iostream>
#include <string>
int main() {
std::string str = "Hello";
for(char c : str) {
std::cout << c << std::endl;
}
return 0;
}Output: H E L L O (each on new line)
Loops through each character in the string.
string के हर character को print करता है।
Example 8: Find Substring
#include <iostream>
#include <string>
int main() {
std::string str = "Login Technologies";
size_t pos = str.find("Tech");
if(pos != std::string::npos)
std::cout << "Substring found at position " << pos;
else
std::cout << "Substring not found";
return 0;
}Output: Substring found at position 6
Finds substring position using find().
find() से substring की position बताता है।
Example 9: Erase Part of String
#include <iostream>
#include <string>
int main() {
std::string str = "Hello World";
str.erase(5, 6); // remove " World"
std::cout << str;
return 0;
}Output: Hello
Uses erase() to remove part of string.
erase() से string का हिस्सा हटाता है।
Example 10: Reverse String Manually
#include <iostream>
#include <string>
int main() {
std::string str = "Hello";
for(int i = str.length() - 1; i >= 0; i--) {
std::cout << str[i];
}
return 0;
}Output: olleH
Prints string in reverse order using a loop.
loop से string को उल्टा print करता है।