i want to sprintf() an unsigned long long value in visual C++ 6.0 (plain C).
char buf; //bad coding unsigned __int64 l = 12345678; char t1 = "test1"; char t2 = "test2"; sprintf(buf, "%lli, %s, %s", l, t1, t2);
gives the result
12345678, (null), test1
(watch that test2 is not printed)
and l = 123456789012345 it gives an exception handle
To print an
unsigned __int64 value in Visual C++ 6.0 you should use
%lli (refer to this page on MSDN).
%lli is only supported in Visual Studio 2005 and later versions.
So, your code should be:
sprintf(buf, "%I64u, %s, %s", l, t1, t2);
printf uses the ellipsis to pass a variable argument list. The (null) you see is the second part of your long long, which happen to be all 0 bits. Set it to 1<<60+1<<30 and you'll get a crash as the 1<<60 part is interpreted as a char*.
The correct solution would be to break down the number in three parts of 10 digits, "verylongvalue % 10000000000" "(verylongvalue/10000000000) % 10000000000" "verylongvalue/100000000000000000000".
Apparently, you did not assign
additionaltext to the necessary
char * (string). Note that the
long int was processed, the comma was copied and only the