for (int i = 0; i < 7; i++) { if ((binaryValue >> i) & 1) { g_TimerInfo[i].wifiControlCycle[index++] = '0' + (i + 1); // 周一到周日对应的值是1到7 g_TimerInfo[i].wifiControlCycle[index++] = ','; } }

这段代码是一个循环，用于将 `binaryValue` 的每一位（从低位到高位）与1进行按位与操作。如果结果为1，则表示该位为1，然后将对应的值（i+1）转换为字符类型，并存储在 `g_TimerInfo[i].wifiControlCycle` 数组中。

具体的逻辑如下：

- 通过循环变量 `i` 控制循环次数，从0到6（共7位）。
- 对于每一位，先将 `binaryValue` 右移 `i` 位，然后与1进行按位与操作。
- 如果结果为1，说明该位为1，将对应的值（`i+1`）转换为字符类型，并存储在 `g_TimerInfo[i].wifiControlCycle` 数组中。
- 最后，在存储完每一位对应的值后，将一个逗号 `,` 添加到数组中。

请注意，在使用这段代码之前，确保 `g_TimerInfo` 数组已经定义和初始化，并且 `index` 变量也需要正确初始化。这段代码的作用是根据 `binaryValue` 的二进制表示，将对应的值存储在相应的数组位置中。

相关问题

for (int i = sz - 1; i >= 0; --i, n >>= 1) { str[i] = (n & 1) + '0'; }

& 1) + '0'; }

This code snippet is a loop that iterates through the binary representation of a given integer 'n' and assigns each binary digit to a string 'str' in reverse order.

The loop starts from the last binary digit and goes towards the first digit. At each iteration, the least significant bit (the rightmost digit) of 'n' is extracted using the bitwise AND operator with value 1. This is done to check if the last digit is 1 or 0. If it is 1, then it is added to the string 'str' as a character '1', else it is added as a character '0'.

The bitwise right shift operator '>>=' is used to shift the bits of 'n' to the right by 1 position. This is done to discard the least significant bit that has been added to the string 'str' in the current iteration. The loop continues until all bits of 'n' have been processed and added to the string 'str' in reverse order.

Overall, this code snippet is useful for converting an integer into its binary representation as a string.

struct student { char name[20]; int id; int room; }; // 冒泡排序函数 void bubble_sort(struct student stu[], int n, int key) { int i, j; struct student temp; switch (key) { case 1: // 按姓名排序 for (i = 0; i < n-1; i++) { for (j = 0; j < n-i-1; j++) { if (strcmp(stu[j].name, stu[j+1].name) > 0) { temp = stu[j]; stu[j] = stu[j+1]; stu[j+1] = temp; } } } break; case 2: // 按学号排序 for (i = 0; i < n-1; i++) { for (j = 0; j < n-i-1; j++) { if (stu[j].id > stu[j+1].id) { temp = stu[j]; stu[j] = stu[j+1]; stu[j+1] = temp; } } } break; case 3: // 按房号排序 for (i = 0; i < n-1; i++) { for (j = 0; j < n-i-1; j++) { if (stu[j].room > stu[j+1].room) { temp = stu[j]; stu[j] = stu[j+1]; stu[j+1] = temp; } } } break; } } // 二分查找函数 int binary_search(struct student stu[], int n, int key, int value) { int low = 0, high = n-1, mid; while (low <= high) { mid = (low + high) / 2; switch (key) { case 1: // 按姓名查找 if (strcmp(stu[mid].name, value) == 0) { return mid; } else if (strcmp(stu[mid].name, value) > 0) { high = mid - 1; } else { low = mid + 1; } break; case 2: // 按学号查找 if (stu[mid].id == value) { return mid; } else if (stu[mid].id > value) { high = mid - 1; } else { low = mid + 1; } break; case 3: // 按房号查找 if (stu[mid].room == value) { return mid; } else if (stu[mid].room > value) { high = mid - 1; } else { low = mid + 1; } break; } } return -1; // 没有找到返回-1 } int main() { int n, i, key, value, index; struct student stu[10000]; printf("请输入学生人数："); scanf("%d", &n); for (i = 0; i < n; i++) { printf("请输入第%d个学生的姓名、学号、房号：", i+1); scanf("%s %d %d", stu[i].name, &stu[i].id, &stu[i].room); } printf("请选择排序关键字：\n1.姓名\n2.学号\n3.房号\n"); scanf("%d", &key); bubble_sort(stu, n, key); printf("排序后的结果：\n"); for (i = 0; i < n; i++) { printf("%s %d %d\n", stu[i].name, stu[i].id, stu[i].room); } while (1) { printf("请选择查询关键字：\n1.姓名\n2.学号\n3.房号\n"); scanf("%d", &key); printf("请输入要查询的值："); scanf("%d", &value); index = binary_search(stu, n, key, value); if (index != -1) { printf("查询结果：\n%s %d %d\n", stu[index].name, stu[index].id, stu[index].room); } else { printf("没有找到该学生！\n"); } printf("是否继续查询？（1.是 2.否）"); scanf("%d", &i); if (i == 2) break; } return 0; }按姓名查找出错

在按姓名查找时，程序使用了 `scanf` 函数来读取要查找的姓名，但是在 `binary_search` 函数中使用了 `strcmp` 函数来比较字符串。由于 `scanf` 函数读取字符串时会包含换行符 `\n`，而 `strcmp` 函数会将换行符也视为字符串的一部分，因此会导致查找失败。

解决方法是在读取字符串之后使用 `getchar` 函数来读取并丢弃换行符。修改代码如下：

case 1: // 按姓名查找
    printf("请输入要查询的姓名：");
    scanf("%s", value);
    getchar(); // 读取并丢弃换行符
    index = binary_search(stu, n, key, value);
    break;