A, B and C aren't numbers, they're letters. Probably variables. Without knowing what numbers they represent, we can't calculate their LCM.
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A common denominator is A*B*C. There is not enough information to determine whether or not it is the least such number: that will depend on whether or not the three numbers are co-prime.
The greatest common multiple of any set of integers is infinite.
The greatest factors of A, B, and C, respectively, are the absolute values of A, B, and C. The greatest common factor of A, B, and C is 1.
LCM(8, C, A) = 8*C*A.
The following code for example is a solution (you could do it with less variables, but this is more readable):int GCD(int a, int b){int n, k, c;n = (a>b)?a:b;k = (a>b)?b:a;while (k){c = n%k;n=k;k=c;}return n;}
b 108