Using atoi with char

Question

Is there a way of converting a char into a string in C?

I'm trying to do so like this:

   char *array;

   array[0] = '1';

   int x = atoi(array);

   printf("%d",x);

Answer 1

You need to allocate memory to the string, and then null terminate.

char *array;

array = malloc(2);
array[0] = '1';
array[1] = '\0';

int x = atoi(array);

printf("%d",x);

Or, easier:

char array[10];

array = "1";

int x = atoi(array);

printf("%d",x);

Answer 2

If you're trying to convert a numerical char to an int, just use character arithmetic to subtract the ASCII code:

int x = myChar - '0';
printf("%d\n", x);

Answer 3

char c = '1';
int x = c - '0';
printf("%d",x);

Answer 4

You can convert a character to a string via the following:

char string[2];
string[0] = '1';
string[1] = 0;

Strings end with a NUL character, which has the value 0.

Answer 5

How about:

   char arr[] = "X";
   int x;
   arr[0] = '9';
   x = atoi(arr);
   printf("%d",x);