C 语言中的对数计算程序

---

给定 n 的值作为输入，任务是通过一个函数计算 Log n 的值并显示它。

对数或 Log 是幂运算的反函数，这意味着要计算 log，必须将幂运算作为底数计算出来。

IF

 

$$\log_b x\;\:=\: y\:than\:b^{y}=x$$

例如

 

$$\log_2 64\;\:=\: 6\:than\:2^{6}=64$$

示例

Input-: Log 20
Output-: 4
Input-: Log 64
Output-: 6

算法

Start
In function unsigned int log2n(unsigned int num)
   Step 1-> Return (num > 1) ? 1 + log2n(num / 2) : 0
In function int main()
   Step 1-> Declare and assign num = 20
   Print log2n(num)
Stop

Explore our latest online courses and learn new skills at your own pace. Enroll and become a certified expert to boost your career.

示例

 实时演示

#include <stdio.h>
//We will be using recursive Approach used below is as follows
unsigned int log2n(unsigned int num) {
   return (num > 1) ? 1 + log2n(num / 2) : 0;
}
int main() {
   unsigned int num = 20;
   printf("%u
", log2n(num));
   return 0;
}

输出

4