Question

*Write a function that returns 0 if x is 0, returns -1 if x < 0, returns 1 if x > 0

*Your code must follow the Bit-Level Integer Coding Rules

*You can assume w = 32.

*The only allowed operations in your code are: ! ~ & ^ | + << >>

*This requirement is more restrictive than the coding rules.

*You cannot use if-else statement, switch, loops, and comparison operators( <,>)

int sign(int x)

​

{

return 0;

}

Answer 1

Code:

#include<stdio.h>
int sign (int x)               //sign function which accepts the parameter number x
   {
      
   return 0+(x >> 31)-(-x >> 31);   //logic to return if x>0 then 1 x<0 then -1 x=0 then 0
   //the main logic behind this is first right shift the given num to 31 bits that means for any negative numbsnier right shift to 31 bits gives the value as -1.
   //for all other numbers the value is zero.
   }
int main()
{
   int n;
   printf("Enter the Number:\n");           //asking user to enter the number
   scanf("%d",&n);               //taking number from user
   printf("%d",sign(n));           //calling sign() function by passing number n as argument and printing returned value
   return 0;
}

Code and Outputs Screenshots:

#include<stdio.h> int sign (int x) //sign function which accepts the parameter number x return 0+ (x >> 31)-(-x >> 31); //logic to return if 0 then 1 x<0 then -1 x=0 then o //the main logic behind this is first right shift the given num to 31 bits that means for any negative numbsnier right shift to 31 bits gives the value as -1. 1//for all other numbers the value is zero. int main() int n; printf("Enter the Number: \n"); //asking user to enter the number scanf("%d",&n); //taking number from user printf("%d", sign (n)); //calling sign() function by passing number n as argument and printing returned value return 0;

Enter the Number: 189

Enter the Number: - 190

Enter the Number:

Trace each Test Case:

For input number 189 the return value is 1 because 0+(189 >> 31) - (-189 >> 31) so here 189 >> 31 gives you 0 and -189>>31 gives you -1 so so -(-1) will turn to 1.

For input number -190 the return value is -1 because 0+(-190 >> 31) -(-(190) >> 31) so here -190 >> 31 gives you -1 and 190 >> 31 gives the value 0 so the final answer is 0-1-0=-1.

For input number 0 the return value is 0 because 0+ (0 >> 31) -(-0 >>31)=0+0+0=0.

Note : if you have any queries please post a comment thanks a lot..always available to help you..