找到C中的最高位

int findHighestBit(int c) {
    int highestBit = 0;
    while (c >>= 1) {
        highestBit++;
    }
    return highestBit;
}

int findHighestBit(int c) {
    int highestBit = 0;
    int bit = 1 << 31;
    while (bit > 0) {
        if (c & bit) {
            highestBit = bit;
        }
        bit >>= 1;
    }
    return highestBit;
}

#include <math.h>

int findHighestBit(int c) {
    return (int)log2(c);
}