题解 | #自动售货系统#

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#define MAXLEN 1000
int price[] = {2,3,4,5,8,6};
char nm[] = {"A1", "A2", "A3", "A4", "A5", "A6"};

int initialize(char* input, int i, int* shangpin, int* qianbi) {
    for (int j = 0; j < 6; j++) {
        int tempnum = input[i] - '0';
        if (isdigit(input[i + 1])) tempnum = tempnum * 10 + (input[++i] - '0');
        shangpin[j] = tempnum;
        i += 2;
    }
    for (int j = 0; j < 4; j++) {
        int tempnum = input[i] - '0';
        if (isdigit(input[i + 1])) tempnum = tempnum * 10 + (input[++i] - '0');
        qianbi[j] = tempnum;
        i += 2;
    }
    printf("S001:Initialization is successful\n");
    return (i - 1);
}


int pay(char* input, int i, int* shangpin, int* qianbi, int* balance) {
    int bizhong = 4;
    if (input[i] == '1' && input[i + 1] == '0' && input[i + 2] == ';') {
        bizhong = 3;
        i += 2;
    } else if (input[i] == '5' && input[i + 1] == ';') {
        bizhong = 2;
        i++;
    } else if (input[i] == '2' && input[i + 1] == ';') {
        bizhong = 1;
        i++;
    } else if (input[i] == '1' && input[i + 1] == ';') {
        bizhong = 0;
        i++;
    } else {
        while (input[i] != ';') i++;
        printf("E002:Denomination error\n");
        return i;
    }
    int change = qianbi[0] + qianbi[1] * 2;
    if (bizhong == 3) {
        // 投入的是十元，需要查找我们的零钱是否足够10元。
        if (change < 10) {
            printf("E003:Change is not enough, pay fail\n");
            return i;
        }
    } else if (bizhong == 2) {
        if (change < 5) {
            printf("E003:Change is not enough, pay fail\n");
            return i;
        }
    }
    int goods = 0;
    for (int j = 0; j < 6; j++) {
        goods += shangpin[j];
    }
    if (goods == 0) {
        printf("E005:All the goods sold out\n");
        return i;
    }
    qianbi[bizhong]++;
    if (bizhong == 0) *balance += 1;
    else if (bizhong == 1) *balance += 2;
    else if (bizhong == 2) *balance += 5;
    else *balance += 10;
    printf("S002:Pay success,balance=%d\n", *balance);
    return i;
}


int buy(char* input, int i, int* shangpin, int* qianbi, int* balance) {
    int type = input[i + 1] - '0';
    if (input[i] != 'A' || input[i + 2] != ';' || type > 6 || type < 1) {
        printf("E006:Goods does not exist\n");
        while (input[i] != ';') i++;
        return i;
    }
    type--;
    if(shangpin[type] == 0) {
        printf("E007:The goods sold out\n");
    } else if(*balance < price[type]) {
        printf("E008:Lack of balance\n");
    } else {
        *balance -= price[type];
        shangpin[type]--;
        printf("S003:Buy success,balance=%d\n", *balance);
    }


    return (i + 2);
}

void printcoin(int y1, int y2, int y5, int y10) {
    printf("1 yuan coin number=%d\n", y1);
    printf("2 yuan coin number=%d\n", y2);
    printf("5 yuan coin number=%d\n",y5);
    printf("10 yuan coin number=%d\n",y10);
}

void change(int* qianbi, int* balance) {
    int yuan1 = 0;
    int yuan2 = 0;
    int yuan5 = 0;
    int yuan10 = 0;
    if(*balance != 0) {
        while(*balance >= 10 && qianbi[3] > 0) {
            qianbi[3]--;
            *balance -= 10;
            yuan10++;
        }
        while(*balance >= 5 && qianbi[2] > 0) {
            qianbi[2]--;
            *balance -= 5;
            yuan5++;
        }
        while(*balance >= 2 && qianbi[1] > 0) {
            qianbi[1]--;
            *balance -= 2;
            yuan2++;
        }
        while(*balance >= 1 && qianbi[0] > 0) {
            qianbi[0]--;
            *balance -= 1;
            yuan1++;
        }
        printcoin(yuan1, yuan2, yuan5, yuan10);
    } else {
        printf("E009:Work failure\n");
    }
}

int query(char* input, int i, int* shangpin, int* qianbi) {
    if(input[i] == ' ' && input[i + 1] == '0' && input[i + 2] == ';') {
        i += 2;
        for(int j = 0; j < 6; j++) {
            printf("%s %d %d\n", nm[j], price[j], shangpin[j]);
        }
    } else if(input[i] == ' ' && input[i + 1] == '1' && input[i + 2] == ';') {
        i += 2;
    } else {
        while(input[i] != ';') i++;
        printf("E010:Parameter error\n");
    }
    return i;
}

int main() {
    char* input = (char*)malloc(sizeof(char) * MAXLEN);
    while (fgets(input, MAXLEN, stdin) != NULL) {
        int shangpin[6] = {0};
        int qianbi[4] = {0};
        int len = 0;
        int balance = 0;
        while (input[len] != '\n') {
            len++;
        }
        input[len] = '\0';
        for (int i = 0; i < len; i++) {
            if (input[i] == 'r') {
                i = initialize(input, i + 2, shangpin, qianbi);
            }
            else if (input[i] == 'p') {
                i = pay(input, i + 2, shangpin, qianbi, &balance);
            }
            else if (input[i] == 'b') {
                i = buy(input, i + 2, shangpin, qianbi, &balance);
            }
            else if (input[i] == 'c') {
                change(qianbi, &balance);
                i++;
            }
            else if (input[i] == 'q') {
                i = query(input, i + 1, shangpin, qianbi);
            }

        }

        // printf("%s\n", input);

    }
    free(input);
    return 0;
}