這個括號有點(diǎn)蹊蹺

mcmay

/*一個計(jì)算汽車行駛里程與耗油量的關(guān)系的代碼*/

1. #include <stdio.h>
   
2. 
   
3. int main(void)
   
4. {
   
5.     const float GTOL = 3.785;
   
6.     const float MTOK = 1.609;
   
7.     float mile, gallon, converted_val;
   
8. 
   
9.     printf("Input the mile(s) traveled: ");
   
10.     scanf("%f",&mile);
    
11.     printf("Input the gallon(s) used: ");
    
12.     scanf("%f",&gallon);
    
13.     printf("Mile(s) per gallon: %.1f",mile/gallon);
    
14.     //converted_val = gallon * GTOL / (mile * MTOK * 100.0); 計(jì)算結(jié)果為0.0
    
15.     converted_val = gallon * GTOL / mile * MTOK * 100.0;
    
16.     printf("\nLiter(s) per 100 kilometers: %.1f", converted_val);
    
17.     puts("\nDone!");
    
18. 
    
19.     return 0;
    
20. }

復(fù)制代碼

請問為何代碼當(dāng)中被注釋掉的那一行里的計(jì)算結(jié)果會為0.0呢？是不是跟括號的優(yōu)先級有關(guān)呢？就算是先計(jì)算除數(shù)也應(yīng)該不會讓結(jié)果為零啊。請各位指教！