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 程式師世界 >> 數據庫知識 >> Access數據庫 >> Access數據庫入門 >> Access out of range

Access out of range

編輯:Access數據庫入門

suppose OneLineText is a string

Don't forget to check the index or it could be out of range! Lenthg checking must performe at first rather than access the char in the string or the string will be also out of range!

The following will be out of range because it may acces the character out of the rang before it check the boundary.
=============================================
    while( isalpha( OneLineText.at( i ) ) && ( i < LengthOfText ) )
    {
      i++ ;
    }//end while
=============================================

The following code will be all right.
=============================================
    while( ( i < LengthOfText ) && isalpha( OneLineText.at( i ) ) )
    {
      i++ ;
    }//end while
=============================================

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