函数指针终极练习

 

 设计 9个任务函数task0（）-task8（）只输出一句话：如task0（）输出“task0 is called！”；设计一个调度函数schedule（）输入一个字符串如"012345"然后返回一个函数指针数组和字符串的长度作为执行函数 execute（）的参数进行调度任务函数。主函数只有调度函数。

 

#define M 1000
typedef void (*ptask)();

void task0(){  
     printf("task0 is called！\n");  
}  
void task1(){  
     printf("task1 is called！\n");  
}  
void task2(){  
     printf("task2 is called！\n");  
}  
void task3(){  
     printf("task3 is called！\n");  
}  
void task4(){  
     printf("task4 is called！\n");  
}  
void task5(){  
     printf("task5 is called！\n");  
}  
void task6(){  
     printf("task6 is called！\n");  
}  
void task7(){   
     printf("task7 is called！\n");  
}  
 void task8(){   
     printf("task7 is called！\n");  
}


void execute(ptask* fun , int len){
    int i= 0 ;
    for( i = 0 ; i < len ; i++){
        ptask pfun= fun[i];
        pfun();
    }
}

void schedule(){
    ptask fun[M];
    int len ,i,temp;
    char str[M];
    printf("please input a string\n");
    while(    scanf("%s",str),str){

    len= strlen(str);

    for( i =  0 ; i < len ; i++){
        temp = str[i]-'0';
        switch(temp){
        case 0:fun[i] = task0;break;
        case 1:fun[i] = task1;break;
        case 2:fun[i] = task2;break;
        case 3:fun[i] = task3;break;
        case 4:fun[i] = task4;break;
        case 5:fun[i] = task5;break;
        case 6:fun[i] = task6;break;
        case 7:fun[i] = task7;break;
        case 8:fun[i] = task8;break;
        }
    }
    execute(fun , len);
    }

}

int main(){
    schedule();
    return 0;
}