Thread: multiply by 7

  1. 05-22-2006 #1
    agarwaga
    agarwaga is offline
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    multiply by 7

    how will you multiply a positive number by 7 without using straight forward multiplication and addition.

    best i could find out was
    Code:
    int func(int n){
int temp = n<<3; //multiply by 8
return temp - n;
}
    any more interesting ways of solving this (i don't want subtraction either ???)
  2. 05-22-2006 #2
    Darryl
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    Code:
    int times7(int num)
{
    return num/0.142857;
}
    SWinC - Simple Windows Class
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