try this
Code:
while((x_1 == x_2) || (x_2 == x_3) || (x_3 == x_4) || (x_4 == x_5) || (x_5 == x_6) || (x_6 == x_7) || (x_7 == x_8) || (x_8 == x_9) || (x_9 == x_10) || (x_1 == x_3) || (x_2 == x_4) || (x_3 == x_5) || (x_4 == x_6) || (x_5 == x_7) ||
(x_6 == x_8) || (x_7 == x_9) || (x_8 == x_10) || (x_1 == x_4) || (x_2 == x_5) || (x_3 == x_6) || (x_4 == x_7) ||
(x_5 == x_8) || (x_6 == x_9) || (x_7 == x_10) || (x_1 == x_5) || (x_2 == x_6) || (x_3 == x_7) || (x_4 == x_8) ||
(x_5 == x_9) || (x_6 == x_10) || (x_1 == x_6) || (x_2 == x_7) || (x_3 == x_8) || (x_4 == x_9) || (x_5 == x_10) ||
(x_1 == x_7) || (x_2 == x_8) || (x_3 == x_9) || (x_4 == x_10) || (x_1 == x_8) || (x_2 == x_9) || (x_3 == x_10) ||
(x_1 == x_9) || (x_2 == x_10) || (x_1 == x_10))


You just frogot two brackets
WFG Progger laugh

asking is the best Way to get help laugh laugh laugh