#define _CRT_SECURE_NO_WARNINGS#include stdio.h//二维数组逆置int main10(){int matrix[3][3] {{1,2,3},{4,5,6},{7,8,9}};printf(“逆置前数组\n”);for (int i 0;i 3;i){for (int j 0;j 3;j){printf(“%d”, matrix[i][j]);}printf(“\n”);}for (int i 0;i 3;i){for (int j i 1;j 3;j){int tmp matrix[i][j];matrix[i][j] matrix[j][i];matrix[j][i] tmp;}}printf(“逆置后数组\n”);for (int i 0;i 3;i){for (int j 0;j 3;j){printf(“%d”, matrix[i][j]);}printf(“\n”);}return 0;}//二分查找法int main9(){int arr[] { 1,2,5,6,9,11,15,36,38,45,49,58,68,69,80,88,90,98,99,100};int len sizeof(arr) / sizeof(arr[0]);int i 0;int j len - 1;int mid;int n;printf(“请输入要找的key:”);scanf(“%d”, n);int key n;while (i j){mid i (j - i) / 2;//最好使用mid i(j-i)/2 防止数据溢出//不用mid ((i j) / 2)if (arr[mid] key){i mid 1;}else if (arr[mid] key){j mid - 1;}else{printf(“找到了key!\narr[%d]%d\n”, mid, key);return 0;}}printf(“没找到哦。。。。”);return 0;}//数组逆置int main8(){int arr[] {1,2,3,4,5};int len sizeof(arr) / sizeof(arr[1]);int i 0;int j len - 1;while (i j){int tmp arr[i];arr[i] arr[j];arr[j] tmp;i;j–;}for(int i0;ilen;i){printf(“%d”, arr[i]);}return 0;}//给数组输入元素ctrld向下复制int main7(){int arr[5];int len sizeof(arr) / sizeof(arr[0]);for (int i 0;i len;i){scanf(“%d”, arr[i]);}printf(“刚才输入的数组是\n”);for (int i 0;i len;i){printf(“%d\n”,arr[i ]);//打印地址printf(“arr[%d]为%d\n”,i,arr[i]);//或用%p打印地址}return 0;}//1-100能被3整除的数ctrlk-ctrlc多行注释 ctrlk-ctrlu取消注释int main6(){for (int i 1;i 100;i){if (i % 3 ! 0){continue;}printf(“%d\n”,i);}return 0;}//九九乘法表int main5(){int i,j;printf(“九九乘法表\n”);for (i 1;i 9;i){for (j 1;j i;j) { printf(%d*%d%-2d , j, i, j * i); } printf(\n); } return 0;}//求1-100之间2的倍数之和int main4(){int i;int tmp 0;for (i 1;i 100; i){if (i % 2 0){tmp i;}}printf(“%d”, tmp);return 0;}//求n的阶乘int main3(){int n;int i1;int x1;scanf(“%d”, n);while (in){x* i;i;}printf(“%d”,x);return 0;}//int main2(){int n;scanf(“%d”, n);while (n ! 0){printf(%d , n % 10);nn / 10;}return 0;}//奇偶数int main1(){int n;while (scanf(“%d”, n) ! EOF){if (n % 2 ! 0){printf(“%d is 奇数\n”, n);}else{printf(“%d is 偶数\n”, n);}}return 0;}