谁帮忙看一下这个程序哪有问题

#include<stdio.h>int main(){ double m,tax=0; printf("请输入本月的工资:"); scanf("%lf",&m); if(m<=3500) { tax=m*0; } else if(m>3500&&m<=5000) { tax=m*0.05; } else if(m>5000&&m<=8000) { tax=m*0.12; } else if(m>8000&&m<=12000) { tax=m*0.15; } else if(m>12000) { tax=m*0.2; } else { printf("您应该缴纳的税额为%.2lf,tax,m"); } return 0;}