Question

The bitwise operators are very similar to the ones that you might remember from Java. They are used a lot more frequently in C, though, because C is mostly chosen when you want to write low level programs.

A quick reminder:

& (bitwise AND). Takes two numbers as operand and does AND on every bit of two numbers. The result of AND is 1 only if both bits are 1.

| (bitwise OR). Takes two numbers as operand and does OR on every bit of two numbers. The result of OR is 1 any of the two bits is 1.

^ (bitwise XOR). Takes two numbers as operand and does XOR on every bit of two numbers. The result of XOR is 1 if the two bits are different.

<< (left shift). Takes two numbers, left shifts the bits of first operand, the second operand decides the number of places to shift.

>> (right shift). Takes two numbers, right shifts the bits of first operand, the second operand decides the number of places to shift.

~ (bitwise NOT). Takes one number and inverts all bits of it.

Your assignment:

Write a C program that takes a number from the command line, prints the number, and prints the number of bits in the number that are set to 0 and 1.

For example:

./myProgram 48

Your number was 48.

In 48, there are 30 bits set to 0.

In 48, there are 2 bits set to 1.

Answer 1

Here is the implementation of the above program. To add any additional features in code change it.

I am using number to binary convertor then I am counting 1's in it and for 0's I am doing 32-no_of(1's).

#include <stdio.h>
void decToBinary(int n)
{   
int res = 0;
int binaryNum[32];
int i = 0;
while (n > 0) {
binaryNum[i] = n % 2;
n = n / 2;
i++;
}
for (int j = i - 1; j >= 0; j--)
if(binaryNum[j] == 1) res++;
printf("%d\n",res);
printf("%d",32-res);
}

int main(){
int k;
scanf("%d", &k);
decToBinary(k);
return 0;
}