c++ - Convert single char to int

Question

How can I convert char a[0] into int b[0] where b is a empty dynamically allocated int array

I have tried

char a[] = "4x^0";
int *b;
b = new int[10];
char temp = a[0]; 
int temp2 = temp - 0;
b[0] = temp2;

I want 4 but it gives me ascii value 52

Also doing

a[0] = atoi(temp);

gives me error: invalid conversion from ‘char’ to ‘const char*’ initializing argument 1 of ‘int atoi(const char*)’

Answer 1

You need to do:

int temp2 = temp - '0';

instead.