c how to program 习题 3.17

运行结果：

C语言代码：

/* c how to program 习题 3.17 */
#include <stdio.h>
#include <stdlib.h>

int main()
{
    //定义变量
    int accountNumber;
    double beginningBalance, totalCharges, totalCredits, creditLimit, balance;

    //请输入第一个帐号信息
    printf("Enter account number (-1 to end): ");
    scanf("%d", &accountNumber);

    while(accountNumber != -1){
        //请输入月初余额
        printf("Enter beginning balance: ");
        scanf("%lf", &beginningBalance);

        //请输入本月已支付的金额
        printf("Enter total charges: ");
        scanf("%lf", &totalCharges);
    
        //请输入本月已申请的贷款金额
        printf("Enter total credits: ");
        scanf("%lf", &totalCredits);
    
        //请输入信贷限额
        printf("Enter credit limit: ");
        scanf("%lf", &creditLimit);
    
        //计算新余额
        balance = beginningBalance + totalCharges - totalCredits;
    
        //判断是否超额
        if(balance > creditLimit){

            //如果超额打印信息
            printf("Account:        %d\n", accountNumber);
            printf("Credit Limit:   %.2lf\n", creditLimit);
            printf("Balance:        %.2lf\n", balance);
            printf("Credit Limit Exceeded.\n");
        }

        //请输入下一个帐号信息
        printf("\nEnter account number (-1 to end): ");
        scanf("%d", &accountNumber);
    }

    return 0;
}