Arm/bits1

An unsigned number of n bits can represent values between 0 and 2ⁿ-1, inclusive. Write a function that returns how many bits are needed to represent a given number, in unsigned binary representation.

unsigned int bits(unsigned int num);

Expected solution length: Around 3 lines.

Sample Input

0x1000

Sample Output

r0=13

// A test case to test your function with
.global _start
_start:
    ldr r0, =0x1000
    bl bits
    b _start        // End of testing code

// Return minimum number of bits to represent first parameter
bits:

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arm/bits1

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Arm/bits1

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Sample Input

Sample Output

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