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C program without using Arithmetic operators for Math table?

+2 votes
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Can Anyone write the C program without using Arthimethic operators for Math table?

posted Sep 18, 2013 by Giri Prasad

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Is bitwise operator OK, also math tables means basic operations i.e. +, - , X and /. Please clarify.
Yes is it ok
u already got the answer

1 Answer

+2 votes

Hope below code snippet may help if you are ok with bitwise operator for addition

int xor, and, temp;
and = x & y;
xor = x ^ y; 

while(and != 0 )
{
 and <<= 1; 
 temp = xor ^ and;
 and &= xor; 
 xor = temp; 
}

For multiplying a and b add "a" "b" times

unsigned int mult(unsigned int a,unsigned int b)
{
    unsigned int counter=0;
    unsigned int mult = a;
    if(a == 0 || b == 0)
    {
    return 0;
    }

    //Optimize if any of the number is power of two then
    //Just right shift other with value of this number

    while(counter < b )
    {   
    counter = add(counter,1);
    mult = add(mult,a);
    }
    return mult;
}
answer Sep 18, 2013 by anonymous
Similar Questions
0 votes

I have a recursive function as below,

void func()
{
       if(counter>10)
              return;
       func();
}

Here, I need to come out of the function when counter reaches specific number(10 as per example).
Now, the condition is, I can't take this counter as global or static or can't pass this counter as parameter.

Any suggestion to solve this given above terms.

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