C语言之double

 #include<stdio.h>

 int main(void)
 {
     printf("请分别输入身高的英尺和英寸，""如输入\"5 7\"表示5英尺7英寸：");

     double foot;    //双精度浮点数
     double inch;

     scanf_s("%lf %lf", &foot, &inch);    //double型变量，输入时用%lf

     printf("身高是%f米。\n", (foot + inch / ) * 0.3048);

     return ;
 }

 #include<stdio.h>

 int main(void)
 {
     int a, b;

     scanf_s("%d %d", &a, &b);

     double c = ((double)a + (double)b) / 2.0;    //强制转换数据类型

     printf("%d和%d的平均值=%f\n", a, b, c);

     return ;
 }