How can I convert a string into a number?

Question

there are not many lessons about strings, so I was wondering how can i take a string input and turn it into a number variable.
for example, if input is "1:2", how can I turn it into two int variables "1" and "2"?

Answer 1

For C/C++ -->

https://www.geeksforgeeks.org/converting-strings-numbers-cc/