fixed a settings error

data/3.C语言高阶/3.位运算/2.二进制数/cout.md

-# 计算位数
-
-计算整数的二进制形式有多少位。
-
-## template
-
-```c
-#include <stdio.h>
-
-$code
-
-int main(char** args){
-    printf("bits(%d) has %d bits\n", 100, bits(100));
-    printf("bits(%d) has %d bits\n", 32, bits(32));
-    printf("bits(%d) has %d bits\n", 10, bits(10));
-    printf("bits(%d) has %d bits\n", 25, bits(25));
-    printf("bits(%d) has %d bits\n", 7, bits(7));
-    return 0;
-}
-```
-
-## 答案
-
-```c
-unsigned int bits(unsigned int x){
-    unsigned int n = 0;
-    while(x){
-        x >>= 1;
-        n++;
-    }
-    return n;
-}
-```
-
-## 选项
-
-### 位移计算没有保存
-
-```c
-unsigned int bits(unsigned int x){
-    unsigned int n = 0;
-    while(x){
-        x >> 1;
-        n++;
-    }
-    return n;
-}
-```
-
-### 没有括号导致流程错误
-
-```c
-unsigned int bits(unsigned int x){
-    unsigned int n = 0;
-    while(x)
-        x >>= 1;
-        n++;
-
-    return n;
-}
-```
-
-### 运算符错误
-
-```c
-unsigned int bits(unsigned int x){
-    unsigned int n = 0;
-    while(x){
-        x << 1;
-        n++;
-    }
-    return n;
-}
-```
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