2-12输出华氏摄氏温度转换表

#include<stdio.h>
int main(void) {
int fahr,lower,upper;
double celsius;
scanf("%d",&lower);
scanf("%d",&upper);
if(lower<=upper) {
printf("faher celsius\n");
for(fahr=lower; fahr<=upper; fahr=fahr+2) {
celsius=(5.0/9.0)*(fahr-32);
printf("%4d%6.1lf\n",fahr,celsius);
}
} else printf("Invalid Value!\n");
return 0;
}