int array [4][3] = {1,2,3,4,5,6,7,8,9,0,1,2};int array1[4][3] = {{11,12,13},{14,15,16},{17,18,19},{20}};printf("%d",array[0][0]);printf("\t%d",array1[3][0]);int a = 0 ;int b = 0 ;array[a][b] = 0;printf("\t%d",array[0][0]);int array[][4] = {1,2,3,4,5,6,7,8,9};int array[][4] = {1,2,3,4,5,6,7,8,9};printf("%lu",sizeof(array));int array[][4] = {1,2,3,4,5,6,7,8,9};// printf("%lu",sizeof(array));for (int i = 0; i < 3; i ++) {for (int j = 0; j < 4; j++) {printf("%d ",array[i][j]);}printf("\n");}

        int sum = 0;for (int i = 0; i < 4; i++) {sum = sum + array[0][i];}printf("\n第0行总和:%d",sum);int sum1 = 0    ;for (int i = 0; i < 3; i ++) {for (int j = 0; j < 4; j++) {sum1 =  sum1 + array[i][j];}printf("\n第%d行的总和:%d",i ,sum1);sum1 = 0;}printf("\n");int sum2 = 0;for (int i = 0; i < 4; i++) {for (int j = 0; j < 3; j++) {sum2 = sum2 + array[j][i];//谁变化的快就放到内层循环
                }printf("\n第%d列的总和:%d",i,sum2);sum2 = 0;}

 1         char string[5][20] = {0};
 2         for (int i = 0; i < 5; i++) {
 3             scanf("%s",string[i]);
 4         }
 5
 6         for (int i = 0; i < 4; i++) {
 7             for (int j = 0; j < 4 - i; j++) {
 8                 if (strcmp(string[j], string[j+1]) > 0) {
 9                     char name[20] = {0};
10                     strcpy(name, string[j]);
11                     strcpy(string[j], string[j+1]);
12                     strcpy(string[j+1], name);
13                 }
14             }
15         }
16         for (int i = 0; i < 5; i++) {
17             printf("\n%s",string[i]);
18         }
19     

 1         char string[5][20] = {0};
 2         int minindex = 0;//设最小值为第一个数
 3         for (int i = 0; i < 5; i++) {
 4             scanf("%s",string[i]);
 5         }
 6         for (int i = 0; i < 4; i++) {
 7             for (int j = i + 1; j < 5; j++) {
 8                 if (strcmp(string[minindex], string[j]) > 0) {
 9                     minindex = j;
10                 }
11
12             }
13             if (minindex != i) {
14                 char name[20] = {0};
15                 strcpy(name, string[i]);
16                 strcpy(string[i], string[minindex]);
17                 strcpy(string[minindex], name);
18             }
19         }
20         for (int i = 0; i < 5; i++) {
21             printf("\n%s",string[i]);
22         }
23     

 1         char string[5][20] = {0};
 2         unsigned long maxworld = 0;//定义一个最大的字符串长度
 3         for (int i = 0; i < 5; i++) {
 4             scanf("%s",string[i]);
 5         }
 6         //求出最长长度
 7         for (int i = 0; i < 5; i++) {
 8             if (strlen(string[i]) > maxworld) {
 9                 maxworld =  strlen(string[i]);
10             }
11         }
12         printf("最长长度为:%ld\n",maxworld);
13         for (int i = 0; i < 5; i++) {
14             if (strlen(string[i]) == maxworld) {
15                 printf("%s\t",string[i]);
16             }
17         }
18
19
20         char array[5][20] = {0};
21         unsigned long maxworld = 0;
22         for (int i = 0; i < 5; i++) {
23             scanf("%s",array[i]);
24         }
25         for (int i = 0; i < 5; i++) {
26             if (strlen(array[i]) > maxworld) {
27                 maxworld = strlen(array[i]);
28             }
29         }
30         printf("最长长度:%ld\n",maxworld);
31         for (int i = 0; i < 5; i ++) {
32             if (strlen(array[i]) == maxworld) {
33                 printf("%s  ",array[i]);
34             }
35         }
36