Convert char array to a int number in C

Question

I want to convert a char array[] like:

char myarray[4] = {\'-\',\'1\',\'2\',\'3\'}; //where the - means it is negative

So it should be the

Answer 1

It's not what the question asks but I used @Rich Drummond 's answer for a char array read in from stdin which is null terminated.

char *buff;
size_t buff_size = 100;
int choice;
do{
    buff = (char *)malloc(buff_size *sizeof(char));
    getline(&buff, &buff_size, stdin);
    choice = atoi(buff);
    free(buff);
                    
}while((choice<1)&&(choice>9));