C语言栈的行编辑程序是一个模拟文本编辑器行编辑功能的程序,它使用栈数据结构来保存用户的编辑历史,从而支持撤销(undo)和重做(redo)操作。下面是一个简单的C语言栈行编辑程序的讲解和示例代码。
栈的定义
首先,我们需要定义一个栈的数据结构。栈是一种后进先出(LIFO)的数据结构,我们可以使用数组和指针来实现它。
|
#include <stdio.h> |
|
#include <stdlib.h> |
|
#include <string.h> |
|
#include <stdbool.h> |
|
|
|
#define MAX_STACK_SIZE 100 |
|
#define MAX_LINE_LENGTH 100 |
|
|
|
typedef struct { |
|
char data[MAX_STACK_SIZE][MAX_LINE_LENGTH]; |
|
int top; |
|
} Stack; |
|
|
|
void initStack(Stack *s) { |
|
s->top = -1; |
|
} |
|
|
|
bool isEmpty(Stack *s) { |
|
return s->top == -1; |
|
} |
|
|
|
bool push(Stack *s, const char *str) { |
|
if (s->top >= MAX_STACK_SIZE - 1) { |
|
return false; |
|
} |
|
strcpy(s->data[++s->top], str); |
|
return true; |
|
} |
|
|
|
bool pop(Stack *s, char *str) { |
|
if (isEmpty(s)) { |
|
return false; |
|
} |
|
strcpy(str, s->data[s->top--]); |
|
return true; |
|
} |
|
|
|
void printStack(Stack *s) { |
|
for (int i = s->top; i >= 0; i--) { |
|
printf("%s\n", s->data[i]); |
|
} |
|
} |
行编辑功能
接下来,我们实现行编辑功能,包括输入字符、撤销和重做。
|
void appendChar(Stack *undoStack, char *currentLine) { |
|
char ch; |
|
printf("Enter a character to append: "); |
|
scanf(" %c", &ch); // 注意空格以跳过任何剩余的换行符 |
|
currentLine[strlen(currentLine)] = ch; |
|
push(undoStack, currentLine); |
|
// 清空 redoStack,因为当前操作会覆盖任何可能的重做操作 |
|
while (!isEmpty(redoStack)) { |
|
char dummy[MAX_LINE_LENGTH]; |
|
pop(&redoStack, dummy); |
|
} |
|
} |
|
|
|
void undoOperation(Stack *undoStack, Stack *redoStack, char *currentLine) { |
|
if (isEmpty(undoStack)) { |
|
printf("No more undo operations.\n"); |
|
return; |
|
} |
|
char prevLine[MAX_LINE_LENGTH]; |
|
pop(undoStack, prevLine); |
|
strcpy(currentLine, prevLine); |
|
push(redoStack, prevLine); |
|
} |
|
|
|
void redoOperation(Stack *undoStack, Stack *redoStack, char *currentLine) { |
|
if (isEmpty(redoStack)) { |
|
printf("No more redo operations.\n"); |
|
return; |
|
} |
|
char nextLine[MAX_LINE_LENGTH]; |
|
pop(redoStack, nextLine); |
|
strcpy(currentLine, nextLine); |
|
push(undoStack, nextLine); |
|
} |
主程序
最后,我们编写主程序来整合这些功能。
|
int main() { |
|
Stack undoStack, redoStack; |
|
initStack(&undoStack); |
|
initStack(&redoStack); |
|
char currentLine[MAX_LINE_LENGTH] = ""; |
|
char input; |
|
|
|
while (true) { |
|
printf("Current line: %s\n", currentLine); |
|
printf("Enter 'a' to append a character, 'u' to undo, 'r' to redo, or 'q' to quit: "); |
|
scanf(" %c", &input); // 注意空格以跳过任何剩余的换行符 |
|
|
|
switch (input) { |
|
case 'a': |
|
appendChar(&undoStack, currentLine); |
|
break; |
|
case 'u': |
|
undoOperation(&undoStack, &redoStack, currentLine); |
|
break; |
|
case 'r': |
|
redoOperation(&undoStack, &redoStack, currentLine); |
|
break; |
|
case 'q': |
|
printf("Exiting the line editor.\n"); |
|
return 0; |
|
default: |
|
printf("Invalid input. Please try again.\n"); |
|
} |
|
} |
|
|
|
return 0; |
|
} |
2.
C语言栈的行编辑程序通常用于模拟一个基本的文本编辑器,允许用户输入字符、撤销和重做操作。下面是一个简单的C语言栈行编辑程序的讲解和示例代码。
栈的定义与操作
首先,我们需要定义栈的数据结构以及相关的操作函数,如初始化栈、判断栈是否为空、入栈和出栈。
|
#include <stdio.h> |
|
#include <stdlib.h> |
|
#include <string.h> |
|
#include <stdbool.h> |
|
|
|
#define MAX_STACK_SIZE 100 |
|
#define MAX_LINE_LENGTH 100 |
|
|
|
typedef struct { |
|
char data[MAX_STACK_SIZE][MAX_LINE_LENGTH]; |
|
int top; |
|
} Stack; |
|
|
|
void initStack(Stack *s) { |
|
s->top = -1; |
|
} |
|
|
|
bool isEmpty(Stack *s) { |
|
return s->top == -1; |
|
} |
|
|
|
bool push(Stack *s, const char *str) { |
|
if (s->top >= MAX_STACK_SIZE - 1) { |
|
return false; |
|
} |
|
strcpy(s->data[++s->top], str); |
|
return true; |
|
} |
|
|
|
bool pop(Stack *s, char *str) { |
|
if (isEmpty(s)) { |
|
return false; |
|
} |
|
strcpy(str, s->data[s->top--]); |
|
return true; |
|
} |
行编辑功能
然后,我们实现行编辑功能,包括输入字符、撤销和重做。这里我们使用两个栈:一个用于撤销(undoStack),另一个用于重做(redoStack)。
|
void appendChar(Stack *undoStack, char *currentLine) { |
|
char ch; |
|
printf("Enter a character to append: "); |
|
scanf(" %c", &ch); // 注意空格以跳过任何剩余的换行符 |
|
currentLine[strlen(currentLine)] = ch; |
|
push(undoStack, currentLine); |
|
// 清空 redoStack,因为当前操作会覆盖任何可能的重做操作 |
|
while (!isEmpty(redoStack)) { |
|
char dummy[MAX_LINE_LENGTH]; |
|
pop(&redoStack, dummy); |
|
} |
|
} |
|
|
|
void undoOperation(Stack *undoStack, Stack *redoStack, char *currentLine) { |
|
if (isEmpty(undoStack)) { |
|
printf("No more undo operations.\n"); |
|
return; |
|
} |
|
char prevLine[MAX_LINE_LENGTH]; |
|
pop(undoStack, prevLine); |
|
strcpy(currentLine, prevLine); |
|
push(redoStack, currentLine); |
|
} |
|
|
|
void redoOperation(Stack *undoStack, Stack *redoStack, char *currentLine) { |
|
if (isEmpty(redoStack)) { |
|
printf("No more redo operations.\n"); |
|
return; |
|
} |
|
char nextLine[MAX_LINE_LENGTH]; |
|
pop(redoStack, nextLine); |
|
strcpy(currentLine, nextLine); |
|
push(undoStack, nextLine); |
|
} |
主程序
最后,我们编写主程序来整合这些功能。
|
int main() { |
|
Stack undoStack, redoStack; |
|
initStack(&undoStack); |
|
initStack(&redoStack); |
|
char currentLine[MAX_LINE_LENGTH] = ""; |
|
char input; |
|
|
|
while (true) { |
|
printf("Current line: %s\n", currentLine); |
|
printf("Enter 'a' to append a character, 'u' to undo, 'r' to redo, or 'q' to quit: "); |
|
scanf(" %c", &input); // 注意空格以跳过任何剩余的换行符 |
|
|
|
switch (input) { |
|
case 'a': |
|
appendChar(&undoStack, currentLine); |
|
break; |
|
case 'u': |
|
undoOperation(&undoStack, &redoStack, currentLine); |
|
break; |
|
case 'r': |
|
redoOperation(&undoStack, &redoStack, currentLine); |
|
break; |
|
case 'q': |
|
printf("Exiting the line editor.\n"); |
|
return 0; |
|
default: |
|
printf("Invalid input. Please try again.\n"); |
|
} |
|
} |
|
|
|
return 0; |
|
} |
运行示例
当运行这个程序时,用户可以通过输入字符来编辑当前行,通过输入 'u' 来撤销上一步操作,通过输入 'r' 来重做上一步撤销的操作,或者通过输入 'q'