Question

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How to printf “unsigned long” in C?

I have my number like so…

int unsigned long number = 600851475143;

I am trying to print it with printf(). Every time I try, I get a warning by the compiler.

I’ve tried %uld, %ld and Googling hasn’t seemed to find me the answer.

I’m learning C, but have not had to use a long int before, so I’m not sure what I should be using.

What is the specifier I am chasing?

Answer 1

I recommend using standard order (i.e. unsigned long int). %lu is the format tag you’re looking for.

printf("%lu", 5ul);