#include<iostream> using namespace std; double cash = 0; void income(double amount) { if (amount <= 0) { cout << "Invalid amount entered, please enter a positive value." << endl; return; } cash += amount; cout << "Income of " << amount << " added to cash balance." << endl; } void expend(double amount) { if (amount <= 0){ cout << "Invalid amount entered. please enter a positive value." << endl; return; } if (amount > cash) { cout << "Insufficient funds. please enter a lower amount." << endl; return; } cash -= amount; cout << "Expenses of " << amount << " deducted from cash balance." << endl; } void balance() { cout << "Cash balance: " << cash << endl; } int main() { int option; printf ("1-Income\t2-Expend\n3-BALANCE\t0-Exit\n"); do{ printf("please enter an option:"); scanf("%d",&option); if (option<0||option>3){ printf ("Data Error!\n"); continue; } switch(option){ case 1:income();break; case 2:expend();break; case 3:balance();break; default:break; } }while(option!=0); return 0; }给我纠错

在程序中，income()和expend()函数被调用时，没有传递参数，但是函数定义中需要一个double类型的参数。可以修改为以下代码：

case 1: {
        double amount;
        printf("please enter the amount of income:");
        scanf("%lf", &amount);
        income(amount);
        break;
    }
case 2: {
        double amount;
        printf("please enter the amount of expenditure:");
        scanf("%lf", &amount);
        expend(amount);
        break;
    }

此外，程序中使用了printf和scanf函数，应该将头文件改为<stdio.h>。完整代码如下：

#include<stdio.h>
double cash = 0;

void income(double amount) {
    if (amount <= 0) {
        printf("Invalid amount entered, please enter a positive value.\n");
        return;
    }
    cash += amount;
    printf("Income of %.2lf added to cash balance.\n", amount);
}

void expend(double amount) {
    if (amount <= 0) {
        printf("Invalid amount entered. please enter a positive value.\n");
        return;
    }
    if (amount > cash) {
        printf("Insufficient funds. please enter a lower amount.\n");
        return;
    }
    cash -= amount;
    printf("Expenses of %.2lf deducted from cash balance.\n", amount);
}

void balance() {
    printf("Cash balance: %.2lf\n", cash);
}

int main() {
    int option;
    printf("1-Income\t2-Expend\n3-BALANCE\t0-Exit\n");
    do {
        printf("please enter an option:");
        scanf("%d", &option);
        if (option < 0 || option > 3) {
            printf("Data Error!\n");
            continue;
        }
        switch(option) {
            case 1: {
                double amount;
                printf("please enter the amount of income:");
                scanf("%lf", &amount);
                income(amount);
                break;
            }
            case 2: {
                double amount;
                printf("please enter the amount of expenditure:");
                scanf("%lf", &amount);
                expend(amount);
                break;
            }
            case 3:
                balance();
                break;
            default:
                break;
        }
    } while(option != 0);
    return 0;
}