#include <stdio.h>int main(void){        long feet = 0L;     long inches = 0L;    double length = 0.0;    double width = 0.0;    const long inches_per_feet = 12L;    const double inches_per_yard = 36L;        // get the length of the room    printf("Enter the length in foot and inches, whole foot first:");    scanf("%ld", &feet);    printf("                                 ...Now Enter the inches");    scanf("%ld", &inches);    length = (feet*inches_per_feet+inches)/inches_per_yard; //复制最好         //get the width of the room    printf("Enter the width of the room in feet and inches, - whole feet first");    scanf ("%ld", &feet);    printf ("                                            ... now enter the inches");    scanf ("%ld", &inches);    width = (feet*inches_per_feet+inches)/inches_per_yard;        //out put the area    printf ("the area of the room is %.2f square yares. \n", length*width);    return 0; }