windows下操作64位无符号数的问题 - Chinaunix

原帖由 SeaKing911 于 2007-6-11 18:40 发表
大家帮我看看附件的代码.

在unix下没有问题.

在windows vc60下就有问题,感觉是windows下的"+"符号返回值不能超过32位.

windows是windows xp 32位.cpu是intel双核64位的.

unix是solaris10,6 ...

原帖由 zx_wing 于 2007-6-11 20:55 发表

建议楼主简化问题，直接把你认为有错或者不理解的代码发出来

int main( int argc, char* argv[] )
{

char szTmp1[20] = "65c136018f9dea84";

UINT64 llMsg(0),llMsgTmp(0),llTmp(0); //就只有这里用到UINT64, 前面的100多行，完全跟算法无关，建议发贴时直接改成 unsigned long long

printf( "sizeofRtn = %d\n", sizeof( llMsg ) );

memset( szTmp1, 0, 20 );
strcpy( szTmp1, "65c136028f9dea84" );

int i = 0, j = 0, k = 0;
int nRtn = 0; //这个好像没怎么用到, main返回时总是0

for( i = 19; i >= 0; i-- )
{
if( szTmp1[ i ] == 0 )
      continue;

if( szTmp1[ i ] >= '0' && szTmp1[ i ] <= '9' )
{
      llTmp = szTmp1[ i ] - '0';
}
else if( szTmp1[ i ] >= 'a' && szTmp1[ i ] <= 'f' )
{
      llTmp = szTmp1[ i ] - 'a' + 10;
}
else if( szTmp1[ i ] >= 'A' && szTmp1[ i ] <= 'F' )
{
      llTmp = szTmp1[ i ] - 'A' + 10;
}
else
{
      nRtn = -1;
      break;
}

if( j == 0 )
{
      j = i;
      printf( "j = %d\n", j );
}

printf( "llTmp = %x\n", llTmp );
printf( "szTmp1[ i ] = %c\n", szTmp1[ i ] );

llMsgTmp = 1;
for( k = 0; k < ( j - i ); k++ )
{
      llMsgTmp = llMsgTmp * 16;
}

llMsg = llMsg + llTmp*( llMsgTmp );

getchar();

printf( "llMsg = %016llx\n", llMsg );
printf( "i = %d\n", i );
}

printf( "llMsg = %016llx\n", llMsg );
printf( "Out i = %d\n", i );

return 0;

}

sizeofRtn = 8
j = 15
llTmp = 4
szTmp1[ i ] = 4

llMsg = 0000000000000004
i = 15
llTmp = 8
szTmp1[ i ] = 8
llMsg = 0000000000000084
i = 14
llTmp = a
szTmp1[ i ] = a

llMsg = 0000000000000a84
i = 13
llTmp = e
szTmp1[ i ] = e

llMsg = 000000000000ea84
i = 12
llTmp = d
szTmp1[ i ] = d

llMsg = 00000000000dea84
i = 11
llTmp = 9
szTmp1[ i ] = 9

llMsg = 00000000009dea84
i = 10
llTmp = f
szTmp1[ i ] = f

llMsg = 000000000f9dea84
i = 9
llTmp = 8
szTmp1[ i ] = 8

llMsg = 000000008f9dea84
i = 8
llTmp = 2
szTmp1[ i ] = 2

llMsg = 000000028f9dea84
i = 7
llTmp = 0
szTmp1[ i ] = 0

llMsg = 000000028f9dea84
i = 6
llTmp = 6
szTmp1[ i ] = 6

llMsg = 000006028f9dea84
i = 5
llTmp = 3
szTmp1[ i ] = 3

llMsg = 000036028f9dea84
i = 4
llTmp = 1
szTmp1[ i ] = 1

llMsg = 000136028f9dea84
i = 3
llTmp = c
szTmp1[ i ] = c

llMsg = 00c136028f9dea84
i = 2
llTmp = 5
szTmp1[ i ] = 5

llMsg = 05c136028f9dea84
i = 1
llTmp = 6
szTmp1[ i ] = 6

llMsg = 65c136028f9dea84
i = 0
llMsg = 65c136028f9dea84
Out i = -1