Unsure how I'm coding wrong...?

I'm trying to take the number the user entered and keep adding it to the total then display the final total





extern void main()


{


//Ask user how many numbers they have to input


int iNum = 0;








cout%26lt;%26lt;';Enter how many numbers you have to enter: (or -1 to quit)';%26lt;%26lt; endl;


cin%26gt;%26gt; iNum;





int iTotal;


for ( int x = 1; x %26lt;= iNum; x++ )


{





cout %26lt;%26lt; ';Enter Number: ';%26lt;%26lt;endl;


cin %26gt;%26gt; iTotal;


int iGrandTotal;


iGrandTotal += iTotal;


}





cout %26lt;%26lt; ';Total is: '; %26lt;%26lt; iTotal %26lt;%26lt; endl;Unsure how I'm coding wrong...?
extern void main()


{


int iNum = 0;


int iInputNum;


int iGrandTotal;








//Ask user how many numbers they have to input


cout%26lt;%26lt;';Enter how many numbers you have to enter: (or -1 to quit)';%26lt;%26lt; endl;


cin%26gt;%26gt; iNum;





for ( int x = 1; x %26lt;= iNum; x++ )


{


cout %26lt;%26lt; ';Enter Number: ';%26lt;%26lt;endl;


cin %26gt;%26gt; iInputNum;





iGrandTotal += iInputNum;


}





cout %26lt;%26lt; ';Total is: '; %26lt;%26lt; iGrandTotal %26lt;%26lt; endl;


}Unsure how I'm coding wrong...?
us this your vars are all mixed up:


extern void main()


{


//Ask user how many numbers they have to input


int iNum = 0;








cout%26lt;%26lt;';Enter how many numbers you have to enter: (or -1 to quit)';%26lt;%26lt; endl;


cin%26gt;%26gt; iNum;





int iTotal;


int iGrandTotal;


for ( int x = 1; x %26lt;= iNum; x++ )


{





cout %26lt;%26lt; ';Enter Number: ';%26lt;%26lt;endl;


cin %26gt;%26gt; iTotal;


iGrandTotal += iTotal;


}





cout %26lt;%26lt; ';Total is: '; %26lt;%26lt; iGrandTotal %26lt;%26lt; endl;