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char array to integer

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I need to convert a char array to its corresponding unsigned integer value.
For example, if

char[0]=x (equivalent to 120)
char[1]=y (=121)
char[2]=z (=122)

then my integer value would be 120121122. My array is 32 char
there a better way to do that than this:

char c_array[32], i_array[96];
i=sprintf ( i_array, "%u%u%u....%u", c_array[0],
c_array[1],...,c_array[31] );
my_int = atoi (i_array);

(i made i_array 96 since each char can be represented by a 3 digit number)


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