【C语言程序设计第四版】例10-1代码

#include <stdio.h>
#define MAXN 100

int Count = 0;
void select_(int a[], int option, int value);
void input_array(int a[]);
void print_array(int a[]);
void insert(int a[], int value);
void remove_(int a[], int value);
void query(int a[], int value);

int main(void){
    int option, value, a[MAXN];
    
    input_array(a);
    printf("[1] Insert 
");
    printf("[2] Delete 
");
    printf("[3] Query 
");
    printf("[Other option] End
");
    while (1) {
        printf("Input option:");
        scanf("%d", &option);
        if (option<1 || option>3) {
            break;
        }
        printf("Input an element:");
        scanf("%d", &value);
        select_(a, option, value);
        printf("
");
    }
    printf("Tanks.");
    return 0;
    
}

void select_(int a[], int option, int value){
    switch (option) {
        case 1:
            insert(a, value);
            break;
        case 2:
            remove_(a, value);
            break;;
        case 3:
            query(a, value);
            break;
    }
}

void input_array(int a[]){
    printf("Input the number of array elements:");
    scanf("%d", &Count);      // 使用全局变量
    printf("Input an ordered array element:");
    for (int i = 0; i < Count; i++) {
        scanf("%d", a + i);
    }
}

void print_array(int a[]){
    printf("The ordered array a is:");
    for (int i = 0; i < Count; i++) {
        if (i == 0) {
            printf("%d", a[i]);
        }else printf(" %d", a[i]);
    }
}


void insert(int a[], int value){
    int i, j;
    for (i = 0; i < Count; i++) {
        if (value < a[i]) {
            break;
        }
    }
    for (j = Count - 1; j >= i; j--) {
        a[j+1] = a[j];
    }
    a[i] = value;
    Count++;
    print_array(a);
}

void remove_(int a[], int value){
    int i, index = -1;
    for (i = 0; i<Count; i++) {
        if (value == a[i]) {
            index = i;
            break;
        }
    }
    if (index == -1) {
        printf("Failed to find the data, deletion failed.");
    }else{
        for (i = index; i<Count-1; i++) {
            a[i] = a[i+1];
        }
        Count--;
    }
    print_array(a);
}

void query(int a[], int value){
    int mid, left=0,right = Count-1;
    while (left <= right) {
        mid = (left + right) / 2;
        if (value == a[mid]) {
            printf("The index is : %d", mid);
            return;
        }else if(value < a[mid])
            right = mid -1;
        else
            left = mid + 1;
    }
    printf("This element does not exist.");
    
}