How to Convert String Type to Long Type

To convert a string type to a long type, follow these steps depending on the programming language you’re using:

Java

Use Long.parseLong() method:

try {
    String str = “12345”;
    long num = Long.parseLong(str);
    System.out.println(num); // Output: 12345
} catch (NumberFormatException e) {
    e.printStackTrace();
}

try {

String str = “12345”;

long num = Long.parseLong(str);

System.out.println(num); // Output: 12345

} catch (NumberFormatException e) {

e.printStackTrace();

}

Python

Use the int() function, as long is deprecated in Python 3:

str_num = “12345”
num = int(str_num)
print(num)  # Output: 12345

str_num = “12345”

num = int(str_num)

print(num) # Output: 12345

C

Use Convert.ToInt64() or long.Parse():

string str = “12345”;
try {
    long num = Convert.ToInt64(str);
    Console.WriteLine(num); // Output: 12345
} catch (FormatException) {
    Console.WriteLine(“Invalid string format.”);
}

string str = “12345”;

try {

long num = Convert.ToInt64(str);

Console.WriteLine(num); // Output: 12345

} catch (FormatException) {

Console.WriteLine(“Invalid string format.”);

}

JavaScript

Use parseInt():

const str = “12345”;
const num = parseInt(str, 10);
console.log(num); // Output: 12345

const str = “12345”;

const num = parseInt(str, 10);

console.log(num); // Output: 12345

Important Considerations:
– Exception Handling: Always handle exceptions to manage invalid input gracefully.
– Validation: Validate the string before conversion if possible.
– Testing: Test with various cases, including valid and invalid inputs, to ensure robustness.

By following these steps, you can effectively convert a string to a long type in your preferred programming language.