32/64-bit platform printf UInt64 method

In the 32-bit platform typedef unsigned long int uint64_t;
In the 64-bit platform typedef unsigned long int uint64_t;
Different typdef require that different length modifier,uint64_t be used in printf to use LL in 32 bits and use L in 64 bits. In addition to defining the data type, C99 also defines how the corresponding data type is printed, using PRIu64 to print UInt64, for example:

#include <stdio.h>
#include <inttypes.h>


int main (int argc, char *argv[])
{
    uint64_t u64 = ;
    printf ("UInt64:%" PRIu64 "\ n", u64);
    printf ("UInt64:%lu\n", u64);   x86_84
    //printf ("UInt64:%llu\n", u64);  x86 return
    0;
}

In addition to PRIu64, INTTYPES.H also defines macros for other data types. In addition, if it is a C + + program, you need to define __stdc_format_macros macros.