how to get an integer from a char array

Question

I have a char array that has '4''5'. But I want to convert those characters into actual integers so I subtract '0' from each index of the char array and store it into the same array. If I want to set an int called value to the 45 (the stuff inside the char array) How would I do it?

Answer 1

atoi() converts string to integer. For example if you already have the char array and integer variable declared you can do:

   val = atoi(theCharArray);

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Answer 2

int int_value;
int_value = atoi(your_char_array);

the atoi() Function is used to convert string to int .
more information about atoi() Here .