简单Demo之温度转换

#include<stdio.h>

#define UPPER 300
#define LOWER 0
#define STEP  20
void main()
{
    printf("fahr	celsius
");
    for (int fahr = LOWER; fahr <= UPPER; fahr += STEP)
    {
        printf("%3d	%6.1f
", fahr, (5.0 / 9.0)*(fahr - 32));
    }
}