浮點輸出不正確

Question

我已經創建了一個程序，它爲用戶提供一個輸入，然後讓他們輸入他們想要給這個輸入的數量，但是當我打印總數和金額時。然而，這是全線returing的值相同：即

總計：5.00 食品：5.00 賬單：5.00 行程：5.00 的fags：5.00

代替：

總計：14.00 食品：2.00 賬單：3.00 行程：4.00 的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; 

}

任何想法？

Answer 1

將&放在printf，這意味着你傳遞值的位置，而不是值本身。

Answer 2

變化

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); 

聽編譯器時，它說，

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

Answer 3

你應該在printf，而不是地址使用的值。

Answer 4

如果在最後刪除&如果代碼塊，一切都將正常工作

Answer 5

你也可以通過這個鏈接是爲什麼printf的取值和 Why scanf must take the address of operator

Answer 6

除了以前的答案關於printf，您還需要初始化包含總值的浮點變量。喜歡的東西：

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);