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c++ Standard error shown in signed*unsigned multiplication table

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Compilation time: 1,76 sec, absolute running time: 0,21 sec, absolute service time: 1,99 sec 
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 Multiplication table of signed(2)*unsigned(2) = 

      u8 u16 u32 u64
 i8   +   +   +   +  
 i16  +   +   +   +  
 i32  +   +   +   +  
 i64  +   +   +   +  

 Multiplication table of signed(-2)*unsigned(2) = �

      u8 u16 u32 u64
 i8   +   +   +   +  
 i16  +   +   +   +  
 i32  +   +   +   +  
 i64  +   +   +   +  

 Multiplication table of signed(-3)*unsigned(3) = �

      u8 u16 u32 u64
 i8   +   +   +   +  
 i16  +   +   +   +  
 i32  +   +   +   +  
 i64  +   +   +   +  

 Multiplication table of signed(-5)*unsigned(5) = �

      u8 u16 u32 u64
 i8   +   +   +   +  
 i16  +   +   +   +  
 i32  +   +   +   +  
 i64  +   +   +   +