c - 扫描仪不工作(C 代码)

Question

这是我的代码:

#include <stdio.h>

float calculateBalance(float payment, float balance, float rate);

int main(void){
    float loanAmount, interestRate, monthlyPayment;

    printf("Enter amount of loan:");
    scanf("%.2f", &loanAmount);

    printf("\nEnter interest rate:");
    scanf("%.1f", &interestRate);

    printf("\nEnter monthly payment:");
    scanf("%.2f", &monthlyPayment);

    loanAmount = calculateBalance(monthlyPayment, loanAmount, interestRate);
    printf("Balance remaining after first payment: %.2f\n", loanAmount);

    loanAmount = calculateBalance(monthlyPayment, loanAmount, interestRate);
    printf("Balance remaining after second payment: %.2f\n", loanAmount);

    loanAmount = calculateBalance(monthlyPayment, loanAmount, interestRate);
    printf("Balance remaining after third payment: %.2f\n", loanAmount);
}

float calculateBalance(float payment, float balance, float rate){
    return (balance-payment + balance*rate);
}

我正在尝试计算三笔付款后的余额；但是，当我尝试在终端中运行代码时，它不允许我输入任何内容，而只是读取随机数，然后计算三笔付款后的余额(我希望能够输入内容，但它不是允许我这样做)。我该如何解决这个问题？

Answer 1

问题出在 fmt 字符串本身。正如@T.C.在评论中说道

尝试使用

scanf("%f", &var);

相反。如果只有 2 个 dec 值，那么它只会读取该值。