long long data type in C99 and C90
C99 supports the integral data type
This type is 64 bits wide in the ARM compilation tools.
long long int j = 25902068371200; // length of light // day, meters unsigned long long int i = 94607304725808000ULL; // length of light // year, meters
long long is also available in C90 when not using
__int64 is a synonym for
__int64 is always available.