Sum of two numbers in a sorted array is equal to given number

Check whether there are two numbers in a sorted array whose sum equals a given value
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Let Array be
A[] = {1, 2, 8, 11, 15, 23, 46, 93, 108};

Let 57 be our required sum

beg=0
end=8

reqSum = 57

number1 = A[beg];
number2 = A[end];



do (Untill number1+number2 = reqsum)
{

if ((number1 + number2) > reqsum)
end--;

else if ((number1 + number2) < reqsum)
beg++;

}