How do I printf long long int and also unsigned long long int in C99 using GCC?
I have searched the other posts which suggest to use %lld but it gives these warnings:
warning#1: unknown conversion type character 'l' in format [-Wformat]|
warning#2: too many arguments for format [-Wformat-extra-args]|
For the following attempt:
#include <stdio.h>
int main()
{
long long int x = 0;
unsigned long long int y = 0;
printf("%lld\n", x);
printf("%llu\n", y);
}
If you are on windows and using mingw, gcc uses the win32 runtime, where printf needs %I64d for a 64 bit integer. (and %I64u for an unsinged 64 bit integer)
For most other platforms you'd use %lld for printing a long long. (and %llu if it's unsigned). This is standarized in C99.
gcc doesn't come with a full C runtime, it defers to the platform it's running on - so the general case is that you need to consult the documentation for your particular platform - independent of gcc.
Try to update your compiler, I'm using GCC 4.7 on Windows 7 Starter x86 with MinGW and it compiles fine with the same options both in C99 and C11.
You can try settings of code::block, there is a complier..., then you select in C mode.
来源：https://stackoverflow.com/questions/13590735/printf-long-long-int-in-c-with-gcc