Question

我创建了一个为用户输入输入的程序，然后让他们输入他们想要输入的数量，但是当我打印总数和金额时。然而，这是在全面反转相同的价值：即

总计：5.00 食物：5.00 账单：5.00 旅行：5.00 fags：5.00

而不是：

总计：14.00 食物：2.00 账单：3.00 旅行：4.00 fags：5.00

int main(void)
{

float food = 0.00;
float travel = 0.00;
float bills = 0.00;
float fags = 0.00;
float total = 0.00;

float t_food, t_travel, t_bills, t_fags;

char userInput[3];

while(userInput[0] != 'X')
{

    printf("Select option,\nA: Food\nB: Travel\nC: Bills\nD: Fags\nX: Exit\n");
    scanf("%s", userInput);
    if((userInput[0] == 'A') || (userInput[0] =='a'))
    {
        printf("Please enter an amount: ");
        scanf("%f", &food);
        printf("You have entered: %.2f\n", food);
        t_food += food;

    }
    if((userInput[0] == 'B') || (userInput[0] =='b'))
    {
        printf("Please enter an amount: ");
        scanf("%f", &travel);
        printf("You have entered: %.2f\n", travel);
        t_travel += travel;

    }
    if((userInput[0] == 'C') || (userInput[0] =='c'))
    {
        printf("Please enter an amount: ");
        scanf("%f", &bills);
        printf("You have entered: %.2f\n", bills);
        t_bills += bills;

    }
    if((userInput[0] == 'D') || (userInput[0] =='d'))
    {
        printf("Please enter an amount: ");
        scanf("%f", &fags);
        printf("You have entered: %.2f\n", fags);
        t_fags += fags;

    }
    if((userInput[0] =='X') || (userInput[0] =='x'))
    {
        total = t_food + t_fags + t_travel + t_bills;

        printf("Total: %.2f\n", &total);
        printf("Food: %.2f\n", &t_food);
        printf("Travel: %.2f\n", &t_travel);
        printf("Bills: %.2f\n", &t_bills);
        printf("Fags: %.2f\n", &t_fags);
        break;
    }
}
return 0;

}

有什么想法吗？

Answer 1

更改

    printf("Total: %.2f\n", &total);
    printf("Food: %.2f\n", &t_food);
    printf("Travel: %.2f\n", &t_travel);
    printf("Bills: %.2f\n", &t_bills);
    printf("Fags: %.2f\n", &t_fags);

到

    printf("Total: %.2f\n", total);
    printf("Food: %.2f\n", t_food);
    printf("Travel: %.2f\n", t_travel);
    printf("Bills: %.2f\n", t_bills);
    printf("Fags: %.2f\n", t_fags);

听说编译器，

warning: format ‘%f’ expects argument of type ‘double’, but argument 2 has type ‘float *’ [-Wformat]

Answer 2

将&放在printf中，这意味着您传递了值的位置，而不是值本身。

Answer 3

您应该使用printf中的值，而不是地址。

Answer 4

如果您在上一次删除＆amp; 代码块，则一切正常

Answer 5

你也可以通过这个链接来解释为什么printf取值和 Why scanf must take the address of operator

Answer 6

除了有关printf的先前答案之外，还需要初始化包含总值的浮点变量。类似的东西：

float t_food=0, t_travel=0, t_bills=0, t_fags=0;
...
printf("Total: %.2f\n", total);
printf("Food: %.2f\n", t_food);
printf("Travel: %.2f\n", t_travel);
printf("Bills: %.2f\n", t_bills);
printf("Fags: %.2f\n", t_fags);

浮点输出不正确

6 个答案: