subtract previous variable value from current value

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hey guys,
i have 2 variables, angle_x , angle_y, accelerometer. want subtract current value of variable previous value of same variable. tried this,

int x_initial = angle_x ;
int x_final = x_initial - angle_x

but not sure how make angle_x previous value, , x_initial current value. appreciated. thanks.
sr

code: [select]

static int x_previous = 0;
int x_initial = angle_x ;
int x_final = x_initial - x_previous;
x_previous = angle_x;


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