这个程序目的是测出每加仑油车行驶里程

# include <stdio.h>

int main(void){

double gallons;
double miles;
double product;

printf ( " Enter the gallons used :");
scanf  ( "%f", &gallons);

printf ( " Enter the miles driven :");
scanf  (" %f", &miles);

product = miles / gallons;

printf ( " The miles / gallon for this tank was: %f",product);

return 0;}


结果为什么是 在输入 Enter the gallons used 12.8  Enter the miles driven : 287 后
系统提示我 Floating point error: overflow  谢谢高手!

double的输入输出应该用%lf.
# include <stdio.h>

int main(void){

double gallons;
double miles;
double product;

printf ( " Enter the gallons used :");
scanf  ( "%lf", &gallons);

printf ( " Enter the miles driven :");
scanf  (" %lf", &miles);

product = miles / gallons;

printf ( " The miles / gallon for this tank was: %lf",product);

return 0;}

哦 谢谢您 可是为啥呢 ...呵呵 不是说 我看书上写scanf中不能规定精度嘛 或者1f本身就不是规定精度？ 那它是干嘛的 再次请教  谢谢您

float -> %f
double ->%lf
int ->%d
long ->%ld
这是编译器规则，要想让编译器知道你的想法，你就要按编译器规则做咯

哦 好的 谢谢您啦

以后有不会的还得请教您

好的，一起探讨

朋友，如果问题解决了，就把帖子结了哈