C-二维数组,多维数组

-----二维数组

     ->在数组定义当中,行数和列数需要用常量定义

     ->在定义的时候如果没有数值进行填充,则补零

     ->第一个数是行,第二个数是列

     ->行可以不写,但必须定义列

        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("	%d",array1[3][0]);
    
        int a = 0 ;
        int b = 0 ;
        array[a][b] = 0;
        printf("	%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("
");
        }

     ->所占用的内存空间

        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));

     ->二维数组打印的话需要两层循环的配合,第一层代表行,第二层代表列

        int array[4][5];
        for (int i = 0; i < 4; i ++) {
            for (int j = 0; j < 5; j ++) {
                array[i][j] = arc4random() % 101;
                printf("%d	",array[i][j]);
            }
            printf("
");
        }
    

     ->数组求和练习

 

        int sum = 0;
        for (int i = 0; i < 4; i++) {
            sum = sum + array[0][i];
    
        }
        printf("
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("
第%d行的总和:%d",i ,sum1);
            sum1 = 0;
        }
        printf("
");
        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("
第%d列的总和:%d",i,sum2);
                sum2 = 0;
            }

 

 

——字符串数组(字符数组)

     ->存储多个字符串

     ->char string[i][j] 可以保存i个字符串,每个字符串不能大于j-1个

     第一位度表示可以放几个字符串,第二维度每个字符串表示最大长度-1;

     ->可以用一个下标访问,访问的是整个字符串

     ->两个下标访问的是字符

     ->不能直接替换

    ->得用strcpy

        char string[3][10] = {"maoyuanbo","maomao","hahahaha"};
        printf("%c",string[0][1]);
        printf("
%s",string[1]);
    
    
        char string[3][10] = {"iphone","android","winphone"};
    
        printf("%c",string[0][1]);
        printf("
%s",string[0]);
        strcpy(string[0], "nokia");
        printf("
%s",string[0]);
    

     >冒泡排序

        char string[5][20] = {0};
        for (int i = 0; i < 5; i++) {
            scanf("%s",string[i]);
        }
    
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 4 - i; j++) {
                if (strcmp(string[j], string[j+1]) > 0) {
                    char name[20] = {0};
                    strcpy(name, string[j]);
                    strcpy(string[j], string[j+1]);
                    strcpy(string[j+1], name);
                }
            }
        }
        for (int i = 0; i < 5; i++) {
            printf("
%s",string[i]);
        }
    

     ->选择排序

        char string[5][20] = {0};
        int minindex = 0;//设最小值为第一个数
        for (int i = 0; i < 5; i++) {
            scanf("%s",string[i]);
        }
        for (int i = 0; i < 4; i++) {
            for (int j = i + 1; j < 5; j++) {
                if (strcmp(string[minindex], string[j]) > 0) {
                    minindex = j;
                }
    
            }
            if (minindex != i) {
                char name[20] = {0};
                strcpy(name, string[i]);
                strcpy(string[i], string[minindex]);
                strcpy(string[minindex], name);
            }
        }
        for (int i = 0; i < 5; i++) {
            printf("
%s",string[i]);
        }
    

     ->求最大字符串长度

        char string[5][20] = {0};
        unsigned long maxworld = 0;//定义一个最大的字符串长度
        for (int i = 0; i < 5; i++) {
            scanf("%s",string[i]);
        }
        //求出最长长度
        for (int i = 0; i < 5; i++) {
            if (strlen(string[i]) > maxworld) {
                maxworld =  strlen(string[i]);
            }
        }
        printf("最长长度为:%ld
",maxworld);
        for (int i = 0; i < 5; i++) {
            if (strlen(string[i]) == maxworld) {
                printf("%s	",string[i]);
            }
        }
        
    
        char array[5][20] = {0};
        unsigned long maxworld = 0;
        for (int i = 0; i < 5; i++) {
            scanf("%s",array[i]);
        }
        for (int i = 0; i < 5; i++) {
            if (strlen(array[i]) > maxworld) {
                maxworld = strlen(array[i]);
            }
        }
        printf("最长长度:%ld
",maxworld);
        for (int i = 0; i < 5; i ++) {
            if (strlen(array[i]) == maxworld) {
                printf("%s  ",array[i]);
            }
        }
        

 

——多维数组

 

    int a[2][2][2] = {0};
    int sum = 0,sum1 = 0;
    for (int i = 0; i < 2; i ++) {
        for (int j = 0; j < 2; j ++) {
            for (int k = 0; k < 2; k++) {
                a[i][j][k] = arc4random() % 11;
                printf("%d	",a[i][j][k]);
                sum1 =a[i][j][k] +sum1;
                sum = a[i][j][k] +sum;
            }
            printf("每一行总和:%d",sum1);
            sum1 = 0;
            printf("
");
        }
        printf("每一层总和:%d",sum);
        sum = 0;
        printf("

");
    }