C语言 - 训练营：数组

数组训练营

1 - 互换两个数组数据元素

    // 两行三列
    int array1[2][3] = {{1,2,3},{4,5,6}};
    // 三行两列
    int array2[][2] = {11,12,13,14,15,16}; 
    // 遍历输出
    printf("交换前---------\n");
    printf("array1\n");
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 3; j++) {
            printf("%d  ",array1[i][j]);
        }
        printf("\n");
    }
    printf("\narray2\n");
    
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 2; j++) {
            printf("%d  ",array2[i][j]);
        }
        printf("\n");
    }
    
    
    // 开始交换，搞一个中间变量
    int arrayTem[3][2] ={0};
    
    // 行列互换
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 2; j++) {
            // 先把三行两列的数组赋值给中间数组
            arrayTem[i][j] = array2[i][j];
            // array1 的元素赋值给 array2
            array2[i][j] = array1[j][i];
        }
    }
    // 然后把中间变量赋值给 array1
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 3; j++) {
            array1[i][j] = arrayTem[j][i];
        }
    }
    
    printf("\n交换后----------\n");
    printf("array2\n");
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 2; j++) {
            printf("%d  ",array2[i][j]);
        }
        printf("\n");
    }
    
    printf("\narray1\n");
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 3; j++) {
            printf("%d  ",array1[i][j]);
        }
        printf("\n");
    }

日志信息

2 - 找出数组中的最大值以及下标

    int array [3][4]={0};
    int max = 0;
    for (int i =0; i<3; i++) {
        for (int j =0; j<4; j++) {
            array [i][j]= rand()%41+10; // 搞一个数组
            printf("%d  ",array[i][j]);
            if (max < array[i][j]) {
                max = array[i][j];
            }
        }
        printf("\n");
    }
    printf("最大值为 %d，",max);
    for (int i =0; i<3; i++) {
        for (int j=0; j<4; j++) {
            if (max == array[i][j]) {
                printf("其下标为 %d，%d\n",i,j);
            }
        }
    }
     

日志信息

3 - 有两个数组，它们的取值范围均是 20-40。请分别将两数组中相同下标对应的元素相加，然后把结果放到一个新数组中 

    int a [10]={0};// 数组1
    int b [10]={0};// 数组2
    int c [10]={0};// 存放结果的数组
    for (int i=0;i<10;i++) {
        a [i]=rand()%21+20;
        b [i]=rand()%21+20;
        c[i]=a[i]+b[i];
        printf("%d+%d=%d\n",a[i],b[i],c[i]);
    }

4 - 查找字符之间的空格个数

int count = 0;
char str [50]="I love iOS, I have no iPhone";
for (int i =0; i< strlen(str); i++) {
    if (str[i]==' ') {
        count ++;
    }
}
printf("字符串之间空格的个数为：%d\n",count);

5 - 找出最长名字及其下标

char names [4][21]={"Raphael","Donatello","Leonardo da vinci","Michelangelo"};
unsigned long max = 0;
int index = 0;
for (int i =0; i<4; i++) {
    unsigned long strLong = strlen(names[i]);
    if (max < strLong) {
        max = strLong;
        index = i;
    }
}
printf("最大的字符下标为：%d，其长度为：%lu\n ",index,max);

6 - 将数组元素按照首字母升序排列：冒泡排序

char names [4][100]={"Raphael","Donatello","Leonardo da vinci","Michelangelo"};
for (int i =0; i<4-1; i++) {
    for (int j=0; j<4-1-i; j++) {
        // 两两比较
        if (strcmp(names[j], names[j+1])>0) {
            char temp [20] ={0};
            strcpy(temp , names[j]);
            strcpy(names[j], names[j+1]);
            strcpy(names[j+1], temp );
        }
    }
}
for (int i=0; i<4; i++) {
        printf("%s\n",names[i]);
}