Question

I have a pointer lpBegin pointing to a string “1234”. Now i want this string compare to an uint how can i make this string to unsigned integer without using scanf? I know the string number is 4 characters long.

Answer 1

You will have to use the atoi function. This takes a pointer to a char and returns an int.

const char *str = "1234";  
int res = atoi(str);  //do something with res

As said by others and something I didn’t know, is that atoi is not recommended because it is undefined what happens when a formatting error occurs. So better use strtoul as others have suggested.