ASSG5_B220937CS_KAJA_PRACTICE.c

#include<stdio.h>
#include<stdlib.h>

struct node{
    int PID;
    int BN;
    struct node* next;
    
};

void ADD_patient(struct node **head,int pid,int bn){
     struct node *new =  (struct node*)malloc(sizeof(struct node));
            new->PID = pid;
            new->BN = bn;
            new->next = NULL;
    if((*head) == NULL){
        (*head) = new;
    }
    else{
        struct node *ptr = (*head);
        if(ptr->BN > bn){
            new->next = ptr;
            (*head) = new;
        }
        else{
            while((ptr->next)!=NULL && (ptr->next)->BN < bn){
                ptr = ptr->next;    
            }
            struct node *temp = ptr->next;
            ptr->next = new;
            new->next = temp;
            
        }
    }
}

void CALL_patient(struct node **head){
    if((*head)==NULL){
        printf("0\n");
    }
    else{
        struct node* temp = (*head)->next;
        printf("%d\n",(*head)->PID);
        free((*head));
        (*head) = temp;
        
    }
}

void GET_patient_BN(struct node* head,int wanted){
    if(head == NULL){
        printf("0\n");
    }
    else{
    while( head->next != NULL && head->PID != wanted ){
        head = head->next;
    }
    if(head->PID == wanted){
        printf("%d\n",head->BN);
    }
    else{
        printf("0\n");
    }
    
    }
}
void GET_patient_PID(struct node* head,int wanted){
    if(head == NULL){
        printf("0\n");
    }
    else{
    while( head->next != NULL && head->BN != wanted ){
        head = head->next;
    }
    if(head->BN == wanted){
        printf("%d\n",head->PID);
    }
    else{
        printf("0\n");
    }
    
    }
}
void NEXT_patient(struct node* head){
    if(head == NULL){
        printf("0\n");
    }
    else{
        printf("%d\n",head->PID);
    }
}

void DOCTOR_a(struct node* head){
    int count = 0;
    if(head == NULL){
        printf("0\n");
    }
    else{
        while(head->next != NULL){
            if(head->PID >=1 && head->PID <= 1000){
                printf("%d ",head->PID);
                count++;
            }
            head = head->next;
        }
        if(head->PID >=1 && head->PID <= 1000){
                printf("%d",head->PID);
                count++;
            }
        if(count != 0){
            printf("\n");
        }
        if(count == 0){
            printf("0\n");
        }    
    }
    
}
void DOCTOR_b(struct node* head){
    int count = 0;
    if(head == NULL){
        printf("0\n");
    }
    else{
        while(head->next != NULL){
            if(head->PID >=1001 && head->PID <= 10000){
                printf("%d ",head->PID);
                count++;
            }
            head = head->next;
        }
        if(head->PID >=1001 && head->PID <= 10000){
                printf("%d",head->PID);
                count++;
            }
        if(count != 0){
            printf("\n");
        }
        if(count == 0){
            printf("0\n");
        }    
    }
    
}
void PRINT(struct node* head){
    if(head == NULL){
        printf("0\n");
    }
    else{
        while((head->next) != NULL){
                printf("%d %d\n",head->PID,head->BN);
                head = head->next;
        }
        printf("%d %d\n",head->PID,head->BN);
        
    }
}

int main()
{
    char input[4];
    struct node *list = NULL;
    do{
        scanf(" %s",input);
        
        if (input[0] == 'a'){
            int pid,bn;
            scanf("%d",&pid);
            scanf("%d",&bn);
            ADD_patient(&list,pid,bn);
        }
        else if(input[0] == 'c'){
            CALL_patient(&list);
        }
        else if(input[0] == 'n'){
            NEXT_patient(list);
        }
        else if(input[0] =='b' && input[1] == 'n'){
            int s_pid;
            scanf("%d",&s_pid);
            GET_patient_BN(list,s_pid);
        }
        else if(input[0] =='p' && input[1] == 'i' && input[2]== 'd'){
            int s_bn;
            scanf("%d",&s_bn);
            GET_patient_PID(list,s_bn);
        }
        else if(input[0] == 'd' && input[1] == 'A'){
            DOCTOR_a(list);
        }
        else if(input[0] == 'd' && input[1] == 'B'){
            DOCTOR_b(list);
        }
        else if(input[0] == 'd' && input[1] == '\0'){
            PRINT(list);
        }
        
    }while(input[0] != 'e');

    return 1;
}