C语言 Log2x=n，传入x，求n。

//提示一下，log2(x)=log(x)/log(2)  换底公式

#include#include "stdio.h"

#include "math.h"

double logMath(double x)

{

double n;

n = log10(x)/log10(2);

return n;

}

int main(int argc, const char * argv[]) {

// insert code here...

double n;

double x;

printf("请输入!\n");

scanf("%lf",&x);

n = logMath(x);

printf("计算结果是：%.2f\n",n);

return 0;

}