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状态机的实现无非就是3个要素：状态，事件，响应。转换成具体的行为就3句话

发生了什么事？

现在系统处在什么状态？

在这样的状态下发生了这样的事，系统要干什么？

举例--工作管理系统

#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  // 定义状态枚举  
typedef enum {  STATE_IDLE,  STATE_WORKING,  STATE_DONE,  STATE_ERROR  
} ToolState;  // 定义状态机结构体  
typedef struct {  ToolState currentState;  
} ToolStateMachine;  // 状态转换函数  
void transitionToIdle(ToolStateMachine *sm)
{sm->currentState = STATE_IDLE;  printf("Tool is idle.\n");  
}void transitionToWorking(ToolStateMachine *sm) {  sm->currentState = STATE_WORKING;  printf("Tool is working.\n");  // 在这里执行实际的工作  
}  void transitionToDone(ToolStateMachine *sm) {  sm->currentState = STATE_DONE;  printf("Tool is done.\n");  
}  void transitionToError(ToolStateMachine *sm) {  sm->currentState = STATE_ERROR;  printf("Tool encountered an error.\n");  
}  // 处理用户输入的函数  
void processInput(ToolStateMachine *sm, const char *input) 
{if(strcmp(input, "start")==0){if(sm->currentState == STATE_IDLE){transitionToWorking(sm);}else{printf("Cannot start while not in idle state.\n");}}else if(strcmp(input,"stop")==0){if(sm->currentState == STATE_WORKING){transitionToDone(sm);}else{printf("Cannot stop while not working.\n");}}else if(strcmp(input,"invalid")==0){transitionToError(sm);}else{printf("Unknown command.\n"); }
}int main(void)
{ToolStateMachine sm = {STATE_IDLE};//模拟用户输入processInput(&sm,"start");processInput(&sm,"invalid");processInput(&sm,"stop");return 0;
}