C ++ snacks: % i64d is used in wprintf to format and output Longlong

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• Longlong
• Example
• References

WriteProgramBecause a large integer is required, the Longlong type is required:

 
Longlong nlarge;
 

However, during formatting, you do not know what characters should be used. % d and % l cannot be used.

 

Longlong

Longlong is actually int64 type. In winnt. H, you can see:

 
Typedef _ int64Longlong;
 

Therefore, if you want to output the data, you need to see what format characters _ int64 uses. By checking msdn, we found that:I64.

In formatting the output, you also need to combine a D, that is, % i64d. For unsigned ulonglong, It is % i64u.

 

Example

Longlong nlarge= 9999999888;Wprintf(L"Longlong = % i64d \ n",Nlarge);Ulonglong ularge= 99999998777;Wprintf(L"Ulonglong = % i64u",Ularge);
 

The output is as follows:

Longlong = 9999999888.

Ulonglong = 99999998777

 

References

 
Format specification fields: printf and wprintf Functions
 

 
Http://msdn.microsoft.com/en-us/library/tcxf1dw6 (vs.71). aspx