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I'm trying to use 64 bit integers in C, but am getting mixed signals as to whether it should be possible. When I execute the printf: printf("Size of long int:%d\nSize of long long int:%d\n\n",(int)sizeof(long int), (int)sizeof(long long int)); The response I get is: Size of long int:4 Size of long long int:8 This makes me feel that a long long int has 8 bytes = 64 bits. However, when I try to declare the following variables: long long int a2 = 0x00004444; long long int b2 = 0x000044440; long long int c2 = 0x0000444400; long long int d2 = 0x00004444000; long long int e2 = 0x000044440000; long long int f2 = 0x0000444400004; long long int g2 = 0x00004444000044; long long int h2 = 0x000044440000444; long long int i2 = 0x0000444400004444; The last 4 variables (f2,g2,h2,i2) give me the error message: warning: integer constant is too large for ‘long’ type I get the same result when I replace 'long long int' with 'int64_t'. I assume 'int64_t' was recognized, since it didn't generate any error messages of its own. So, it appears my 8 byte long long int is really a 6 byte long long int, and I don't understand what I'm missing here. If it's any help, here is the information on my gcc compiler: me@ubuntu:~$ gcc -v Using built-in specs. Target: i686-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.4.4-14ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.4 --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib --enable-nls --with-sysroot=/ - -enable-clocale=gnu --enable-libstdcxx-debug --enable-obj

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