C++ stoi() Use Cases & Examples

The stoi function in C++ is used to convert a string to an integer type. Here are some common use cases of the stoi function:

1. Converting a string to an integer: When you need to convert an integer represented as a string to an actual integer type, you can use the stoi function. For example, converting the string “123” to the integer 123.
2. Text file processing: When reading text files, it is often necessary to convert strings to integer type. This can be used to parse numbers in the file for numerical calculations or other operations.
3. User input processing: When a user enters a string from standard input and we need to convert it to an integer type, we can use the stoi function.
4. String processing: In string handling, there are occasions where specific formatted strings need to be converted to integer type for further processing. For example, parsing strings containing numbers to extract the numbers for calculations.
5. Database operations: When working with databases, there are times when it is necessary to convert string fields in the database into integer types. The stoi function can be used to convert string fields from the database into integers, which can be helpful for logical comparisons or calculations.

It is important to note that if a string cannot be converted to an integer type, the stoi function will throw a std::invalid_argument exception. Therefore, error handling should be implemented when using the stoi function to prevent program crashes.