当前课程知识点：C Programming > Chapter 6 Batch Data Processing with Array > 6.4 Two-Dimensional Array Programming > 6.4 Two-Dimensional Array Programming.mp4
大家好
我是云南大学信息学院丁海燕老师
欢迎走进C语言程序设计课堂
今天
我们讲解二维数组的编程
大家请看例1
给一个4行3列的二维数组
输入输出数据
程序如下
{ int a[4][3],i,j,k;
for (i=0; i<4; i++)
for (j=0; j<3; j++)
scanf("%d",&a[i][j]);
for (i=0; i<4; i++)
{ printf(" ");
for (j=0; j<3; j++)
printf("%d\t ",a[i][j]);}
printf(" "); }
程序运行结果如下
输入
1，2，3
回车
4 5 6，回车
7 8 9，回车
10 11 12，回车
原样输出
四行数据
下面来看例2
将一个二维数组的行和列的元素互换
存到另一个二维数组中
例如
a=1，2，3
4，5，6
存到b
1，4
2，5
3，6中
解题思路
可以定义两个数组
数组a为2行3列
存放指定的6个数
数组b
为3行2列
开始时未赋值
将a数组中的元素a[i][j]
存放到b数组中的b[j][i]元素中
用嵌套的for循环完成
程序如下
{int a[2][3]={{1,2,3},{4,5,6}};
int b[3][2],i,j;
for (i=0;i<=1;i++)
{ for (j=0;j<=2;j++)
{ printf("%5d",a[i][j]);
b[j][i]=a[i][j]; }
printf(" ");}
for (i=0;i<=2;i++)
{ for(j=0;j<=1;j++)
printf("%5d",b[i][j]);
输出b的各个元素
printf(" ");}
return 0;}
程序运行结果为
array a为1 2 3回车 4 5 6
array b为
1 4回车
2 5回车
3 6回车
下面来看例3
有一个3×4的矩阵
要求编程序
求出其中值最大的那个元素的值
以及其所在的行号和列号
解题思路
采用“打擂台算法”
先找出任一人站在台上
第2人上去与之比武
胜者留在台上
第3人与台上的人比武
胜者留在台上
败者下台
以后每一个人
都是与当时留在台上的人比武
直到所有人都上台比为止
最后留在台上的是冠军
先把a[0][0]的值赋给变量max
max用来存放当前已知的最大值
a[0][1]与max比较
如果a[0][1]>max
则表示a[0][1]
是已经比过的数据中值最大的
把它的值赋给max
取代了max的原值
以后
依此处理
最后max就是最大的值
算法的N-S结构图
如图所示
首先max=a[0][0]
for i=0 to 2
for j=0 to 3
判断a[i][j]>max吗？
为真
则执行max=a[i][j];
row=i; colum=j
若为假
则开始下一次内循环
最后输出max,row,colum
程序如下
int i,j,
row=0,colum=0,max;
int a[3][4]初始化
max=a[0][0];
for (i=0;i<=2;i++)
for (j=0;j<=3;j++)
if (a[i][j]>max)
{ max=a[i][j];
row=i; colum=j; }
最后输出max,row,colum的值
在这里用max记住最大值
用row记住最大值的行号
用colum记最大值列号
程序运行结果为
max=10,
row=2,
colum=1
下面来看例4
打印杨辉三角形
问题描述
杨辉三角形如下图示
问题分析
一
杨辉三角形的特点是
第一
第一列和对角线上的元素值为1
第二
除以上元素以外
其他元素的值均为
前一行同一列元素
和前一行前一列元素之和
二
用二维数组
yh[6][6]
来存储杨辉三角形中的数据
一
第一列元素可表示为
yh[i][0]
二
对角线元素可表示为yh[i][i]
三
使用循环
将i 值由0 变到5
对第一列和对角线元素赋值
四
其余元素通过表达式
yh[i][j]=yh[i-1][j-1]+yh[i-1][j] 进行赋值
程序如下
{int i,j,yh[6][6]初始化为0
for(i=0;i<6;i++)
{yh[i][0]=1;
yh[i][i]=1;}
for(i=2;i<6;i++)
for(j=1;j yh[i][j]=yh[i-1][j-1]+yh[i-1][j]; 这是在给其他元素赋值 然后通过 两个for循环输出yh[i][j] 数组的内容 就介绍到这儿 我们一起来小结一下 数组 是可以在内存中 连续存储多个元素的结构 数组中的所有元素 必须属于相同的数据类型 数组必须先声明 然后才能使用 声明一个数组 只是为该数组留出内存空间 并不会为其赋任何值 数组的元素通过数组下标访问 一维数组可用一个循环动态初始化 而二维数组可用嵌套循环 动态初始化 二维数组可以看作由 一维数组的嵌套而构成的 好了同学们 二维数组的编程 我们就学到这儿 下节课再见
-1.1 The development and characteristics of C language
--1.The development and characteristics of C language .mp4
--1.1 Self test questions
-1.2 A simple C Language program
--1.2 A simple C Language program.mp4
--【Source program】 Example 1.1 output a line of text Hello, world! "
--【Source program】 Example 1.2 program composed of multiple functions, find the larger of two integers
--1.2 Self test questions
-1.3 Program, Programming Language and C Program Running Steps
--1.3 Program, Programming Language and C Program Running Steps.mp4
--Running steps of C source program in CodeBlocks
--1.3 Self test questions
-chapter 1 Self-Test
-2.1 The Concept and Description of Algorithms
--2.1 The Concept and Description of Algorithms.mp4
--2.1 Self test questions
-2.2 Examples of Simple Algorithms, Computational Thinking and Structured Programming
--2.2 Examples of Simple Algorithms, Computational Thinking and Structured Programming.mp4
--2.2 Self test questions
-Chapter 2 Self test questions
-3.1 Simple Structure and Identifier of C Language Program
--3.1 Simple Structure and Identifier of C Language Program.mp4
--【Source program】 Example 3.1 input two integers and output the sum of two numbers.
--【Source program】 Example 3.2 input two integers and output the average value.
--【Source program】 Example 3.3 output the value of the character variable.
--3.1 Self test questions
-3.2 Constants, Variables and Assignments
--3.2 Constants, Variables and Assignments.mp4
--3.2 Self test questions
-3.3 Arithmetic, assignment, increment and decrement operators
--3.3 Arithmetic, assignment, increment and decrement operators.mp4
--3.3 Self test questions
-3.4 Conditions, commas, addresses, byte operators, and mixed operations among various numerical data
--3.4 Conditions, commas, addresses, byte operators, and mixed operations among various numerical data
--【Source program】 example of sizeof
--3.4 Self test questions
-3.5 Input and Output Examples and Character Input and Output
--3.5 Input and Output Examples and Character Input and Output.mp4
--【Source program】 Example. Find the root of quadratic equation of one variable.
--【Source program】 Example 1. Successively output three characters of BOY.
--【Source program】Example 2. Input 3 characters of BOY from the keyboard and output them to the screen
--3.5 Self test questions
-3.6 Formatted output printf function
--3.6 Formatted output printf function.mp4
--【Source program】 Example 3.4 output of integer data.
--【Source program】 Example 3.5 real data output.
--【Source program】 Example 3.6 character data output.
--【Source program】 Example 3.7 uses %s to output a string.
--3.6 Self test questions
-3.7 Formatted input scanf function
--3.7 Formatted input scanf function.mp4
--【Source program】 Example 3.8 Input and output integer data
--【Source program】Example 3.9 Input and output single precision and double precision real data.
--【Source program】Example 3.10 input and output character data.
--【Source program】Example 3.11 input and output string.
--3.7 Self test questions
-3.8 Basic Data Types of C Language
--3.8 Basic Data Types of C Language.mp4
--3.8 Self test questions
-Chapter 3 Self test questions
-Operator and expression self test questions
-4.1 Relational operators, logical operators, and if statements
--4.1 Relational operators, logical operators, and if statements.mp4
--【source example】Example 4.1 Find the root of the quadratic equation of one variable.
--【Source program】Example 4.2 Input two real numbers and output them from small to large.
--4.1 Self test questions
-4.2 Switch Statement
--【Source program】Example 4.3 uses switch statement to implement simple menu program
--【Source program】Example 4.4 converts centesimal score into the corresponding grade system score.
--4.2 Self test questions
-4.3 Examples of Selection Structural Programs
--4.3 Examples of Selection Structural Programs.mp4
--【Source program】 Example 4.5 determines whether a year is a leap year.
--【Source program】 Example 4.6 find the solution of quadratic equation of one variable.
--【Source program】Example 4.7 calculate the transportation cost for the user.
--4.3 Self test questions
-Chapter 4 Self test questions
-5.1 While and Do-While Statement
--5.1 While and Do…while statement.mp4
--【Source program】example 5.1 Use while statement to find 1 + 2 + 3 + +100
--【Source program】example 5.2 using do while statement to find 1 + 2 + 3 + +100
--5.1 Self test questions
-5.2 For Statement
--【Source program】example 5.3 Use for loop to find 1 + 2 + 3 +100
--5.2 Self test questions
-5.3 Change the State of Loop Execution and Nested Loop
--5.3 Change the state of loop execution and nested loop .mp4
--【Source program】example 5.4 collecting charity donations
--【Source program】example 5.5 output a number between 100 and 200 that cannot be divided by 3.
--【Source program】multiplication table
--【Source program】example 5.6 Output the following 4*5 matrix.
--5.3 Self test questions
-5.4 Loop Structure Program example 1
--5.4 Loop structure program example 1.mp4
--5.4 Self test questions
-5.5 Loop Structure Program example 2
--5.5 Loop structure program example 2.mp4
--【Source program】example 5. Output the following figure.
--【Source program】example6. The problem of 100 chickens and 100 coins
--【Source program】example 7. Find the approximate value of PI
--5.5 Self test questions
-Chapter 5 Self test questions
-6.1 Definition, Reference and Initialization of One-Dimensional Arrays
--6.1 Definition, Reference of One-Dimensional Arrays.mp4
--6.1 Self test questions
-6.2 One-Dimensional Array Programming
--6.2 One-Dimensional Array Programming.mp4
--【Source program】example 1. Fibonacci sequence
--【Source program】example 2. Find the maximum value and the minimum value.
--【Source program】example 3 exchanging array elements in reverse order.
--【Source program】example 4. Bubble sorting.
--6.2 Self test questions
-6.3 Definition, Reference and Initialization of Two-Dimensional Arrays
--6.3 Definition, Reference of Two-Dimensional Arrays.mp4
--6.3 Self test questions
-6.4 Two-Dimensional Array Programming
--6.4 Two-Dimensional Array Programming.mp4
--【Source program】example 1. Get the average score of each subject.
--【Source program】Example 2. The elements of row and column of a 2D array are interchanged
--6.4 Self test questions
-6.5 Definition, initialization and input and output of character arrays
--6.5 Definition, initialization and input and output of character arrays .mp4
--【Source program】Example 6.6 Output a known string.
--【Source program】Example 6.7 Output a diamond.
--【Source program】Example 6.10 Sorting of strings.
--6.5 Self test questions
-6.6 String Processing Function
--6.6 String Processing Function.mp4
--6.6 Self test questions
-6.7 Character Array Programming
--6.7 Character Array Programming.mp4
--6.7 Self test questions
-Chapter 6 Self test questions
-7.1 Function Concept and How to Define and Call Functions
--7.1 Function Concept and How to Define and Call Functions.mp4
--7.1 Self test questions
-7.2 Data Transfer in Function Call, Call Procedure and Function Return Value
--7.2 Data Transfer in Function Call, Call Procedure and Function Return Value.mp4
--7.2 Self test questions
-7.3 Declarations of called functions and nested calls to functions
--7.3 Declarations of called functions and nested calls to functions .mp4
--【Source program】Example 7.4 use a function to find the sum of t
--7.3 Self test questions
-7.4 Recursive call to function
--7.4 Recursive call to function.mp4
--【Source program】Example 7.6. How old is the fifth student?
--【Source program】Example 7.7 Use recursion method to find n!
--7.4 Self test questions
-7.5 Array as function parameter (1)
--7.5 Array as function parameter (1).mp4
--【Source program】Example 7.10
--7.5 Self test questions
-7.6 Array as function parameter (2)
--7.6 Array as function parameter (2).mp4
--【Source program】Selection sorting.
--【Source program】Example 7.13 find the maximum of a 3×4 matrix.
--7.6 Self test questions
-7.7 Local and global variables, internal and external functions
--7.7 Local and global variables, internal and external functions.mp4
--【Source program】Example 7.14
--7.7 Self test questions
-7.8 The Survival Period of Variables and the Storage Mode of Local Variables
--7.8 The Survival Period of Variables and the Storage Mode of Local Variables.mp4
--【Source program】Example 7.17
--7.8 Self test questions
-7.9 Storage Categories of Global Variables
--7.9 Storage Categories of Global Variables.mp4
--7.9 Self test questions
-Chapter 7 Self test questions
-8.1 Pointer Concept, Definition and Reference of Pointer Variables
--8.1 Pointer Concept, Definition and Reference of Pointer Variables.mp4
--8.1 Self test questions
-8.2 Pointer variables as function parameters
--8.2 Pointer variables as function parameters.mp4
--【Source program】Example 8.3. Exchange two data with function call.
--8.2 Self test questions
-8.3 Pointer of array element, operation of pointer and reference of array element by pointer
--8.3 Pointer of array element, operation of pointer and reference of array element by pointer.mp4
--【Source program】Point to array elements with pointer variables.
--8.3 Self test questions
-8.4 Using Array Name as Function Parameter
--8.4 Using Array Name as Function Parameter.mp4
--【Source program】Store array elements in reverse order.
--8.4 Self test questions
-8.5 Reference to multidimensional arrays by pointers
--8.5 Reference to multidimensional arrays by pointers.mp4
--【Source program】Pointer variable pointing to one-dimensional array.
--8.5 Self test questions
-8.6 Referencing strings through pointers
--8.6 Referencing strings through pointers.mp4
--【Source program】Reference string by pointer.
--8.6 Self test questions
-8.7 Character pointer as function parameter
--8.7 Character pointer as function parameter.mp4
--【Source program】Character pointer as function parameter.
--8.7 Self test questions
-8.8 Pointer pointing to function
--8.8 Pointer pointing to function.mp4
--【Source program】Pointer variable pointing to the function.
--8.8 Self test questions
-8.9 Functions that return pointer values
--8.9 Functions that return pointer values.mp4
--【Source program】Intercept substring.
--8.9 Self test questions
-8.10 Pointer arrays and multiple pointers
--8.10 Pointer arrays and multiple pointers.mp4
--【Source program】Sorting of strings.
--8.10 Self test questions
-8.11 Dynamic memory allocation and pointer variables pointing to it
--8.11 Dynamic memory allocation and pointer variables pointing to it.mp4
--【Source program】Dynamic memory allocation.
--8.11 Self test questions
-Chapter 8 Self test questions
-9.1 Define and use structural variables
--9.1 Define and use structural variables.mp4
--【Source program】Structure variable
--9.1 Self test questions
-9.2 Using structure arrays
--9.2 Using structure arrays.mp4
--【Source program】Structure array
--9.2 Self test questions
-9.3 Structure pointer
--【Source program】Structure pointer
--9.3 Self test questions
-Chapter 9 Self test questions
-CodeBlocks Baidu online disk download address
-Final Exam
--final exam
