Question

when I’m trying to compile my c program it gives me this error warning: integer constant is too large for ‘long’ type

which refers to these lines

int barcode, a, b, c;
scanf("%d", &barcode);
a = barcode / 1000000000000;
b = barcode / 100000000000 % 10;
c = barcode / 10000000000 % 10;

and the rest is fine. I know I’m not supposed to use int for such a large number, any suggestions on what I should use? if I replace int with double what should the ‘%d’ part be replaced with then?

Answer 1

Use long longs instead of ints for integer values of that size, with the LL literal suffix:

long long barcode, a, b, c;
scanf("%lld", &barcode);
a = barcode / 1000000000000LL;
b = barcode / 100000000000LL % 10;
c = barcode / 10000000000LL % 10;