Making the Number add up

[Ti22]

ok say i've got an array called

Sales[count]

the value of Sales[1] is 4000 and next time when the user enters the value for Sales[1] instead of replacing the number it adds to the number

eg

Sales[1]=4000
User enters number 5000 for Sales[1]
and instead of Sales[1] becoming 5000 it becomes 9000.

[viaxd]

printf("Enter number :\n");
scanf("%d",&n);

Sales[1] += n;

is that it?