#include<stdio.h>
int main(){
?int a,num,sum;
?printf("請輸入個人收入：");
?scanf("%d",&a);
?if(a>0 && a<5000){
??num = a*0.03;
??sum = a-num-0;
?}
?else if(a<8000){
??num = a*0.1;
??sum = a-num-105;
?}
?else if(a<12500){
??num = a*0.2;
??sum = a-num-555;
?}
?else if(a<35800){
??num = a*0.25;
??sum = a-num-1005;
?}
?else if(a<58500){
??num = a*0.30;
??sum = a-num-2765;
?}
?else if(a<83500){
??num = a*0.35;
??sum = a-num-5505;
?}
?else{
??num = a*0.45;
??sum = a-num-13505;
?}
?printf("應繳納的個人所得稅是：%d元\n",num);
?printf("納稅后的收入為：%d元\n",sum);
}

用if else語句，講不通的變量分離開，在進行函數(shù)的運算