What should be at line number 3 to get the total sum of array "sum" ?

public int totalsum( int[] sum ){
int a, b= 0 ;
//which 'for' loop should be here(line :3)
{
b += sum[ a++ ] ;
}
return b ;
}

Which 'for' loop should be at line number 3 to calculate total sum of the array "sum" :

1. for( int a = 0 ; a< sum.length ; )    

2. for( a= 0 ; a< sum.length ; )    

3. for( a = 0 ; a< sum.length ; a++ )    

4. for( a = 1 ; i <= sum.length ; a++ )

Answer :

(2)

Explanation  :

In 1st option, variable a is declared again i.e. duplicate variable.

In 3rd option, due to extra loop iterator "a++" , the summation would not be correct.

In 4th option. due to initialization a=1  + due to extra loop iterator "a++" , the summation would not be correct.

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