#long-integer

1000 * 60 * 60 * 24 * 30 results in a negative number

You are multiplying ints together, and overflow occurs because the maximum integer is 2^31 - 1. Only after the multiplications does it get converted to a long. Cast the first number as a long. long days_30 = (long) 1000 * 60 * 60 * 24 * 30; or use a long literal: long days_30 = 1000L * 60 * 60 * 24 * 30; That will force long math operations from the start.

Answer: How to printf "unsigned long" in C? #programming #answer #fix

How to printf "unsigned long" in C?

I can never understand how to print unsigned long datatype in C.

Suppose boo is an unsigned long, then I try:

printf("%lu\n", unsigned_boo)

printf("%du\n", unsigned_boo)

printf("%ud\n", unsigned_boo)

printf("%ll\n", unsigned_boo)

printf("%ld\n", unsigned_boo)

printf("%dl\n", unsigned_boo)

And all of them print some kind of -123123123 number instead of unsigned…

How to: How to printf "unsigned long" in C?

How to printf "unsigned long" in C?

I can never understand how to print unsigned long datatype in C.

Suppose boo is an unsigned long, then I try:

printf("%lu\n", unsigned_boo)

printf("%du\n", unsigned_boo)

printf("%ud\n", unsigned_boo)

printf("%ll\n", unsigned_boo)

printf("%ld\n", unsigned_boo)

printf("%dl\n", unsigned_boo)

And all of them print some kind of -123123123 number instead of unsigned…