C语言入门到进阶----Day2（Demo） 15th/Nov./2019

主要内容

两个小demo的实现

Demo 1
输入工资 a元
计算输出这个员工交税后的工资
a<=5000 不交税
5k 8k a>10k 超出10k部分交20%的税，超出8k部分交15%的税，超出5k部分交10%的税

#include 

int main(){
    int wage = 0; //记录工资 
    int pay = 0;//税后工资 
    
    printf("请输入你的工资：");
    scanf("%d",&wage);//scanf中"%d"内不要加其他的东西，&记得取地址 
    
    //计算板块 
    if(wage <= 5000){
    pay = wage;
    }else if(wage > 5000 && wage <= 8000){
    pay = (wage-5000)*0.9 + 5000;
    }else if(wage > 8000 && wage <= 10000){
        pay = (wage-8000)*0.85+3000*0.9+5000;
    }else {
        pay = (wage-10000)*0.8+2000*0.85+3000*0.9+5000;
    }
    printf("到手工资：%d", pay); 
    return 0;
} 

运行结果

运行结果

运行结果

Demo2
要求：输入一个人的年龄，如35，输出“your age is thirty-five”(年龄在1~99之间)

//输入年龄 20 
//your age is twenty;
#include 
int age = 0;
//输入年龄 20 
//your age is twenty;
 
int main(){
    printf("请输入年龄：");
    scanf("%d",&age);//记得scanf取地址&（总会忘） 
    
    /*程序分析 
    age / 10 = 0.2.3.4.5.6...
    age % 10 = 1 2 3 4 5.... 
    定义三个数组
    1~9  [one two three four ... nine]
    10~19 [ten eleven twelve ... nineteen]
    20、30、40...90  [twenty thirty forty fifty ... ninety] 
    */
    
    //保存个位数 one two   字符串char* 
    //定义数组 gewei[] ={} 
    char* gewei[] = {"","one","two","three","four","five","six","seven","eight","nine"};
    //保存10-19
    char* temp[] = {"ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"};
    //保存十位 
    char* shiwei[] = {"twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety"}; 
    
    char* name;//保存每次取出的字符串 name只是一个变量名  char*是字符串 
    if(age < 10){
        //直接访问个位数数组
        //age从1开始  
        name = gewei[age];
    } else if(age >= 10 && age <= 19){
        //获取个位数 （重要） 
        int index = age % 10;
        name = temp[index];
    }else{
        //获取个位数
        int ge = age % 10;
        //获取十位数
        int shi = age /10;
        //取出对应的单词  取字符串char* 
        char* shiString = shiwei[shi-2];//shiString只是一个变量名   char*为定义字符串 
        char* geString = gewei[ge]; 
        
        printf("your age is %s-%s\n",shiString,geString);//%s为字符串 
        //中途程序还未运行完就提前结束 
        return 0;
         
    } 
    
    
    printf("your age is %s\n",name);

    return 0;
}

运行结果

运行结果

运行结果

---

学习心得

晚上一共做了两个小demo，第一个计算工资的demo感觉勉强还能做出来，但第一遍自己写还是会有一些的错误，比如，scanf（"%d",&wage）会错误的写成scanf("%d\n",wage)；其次就是编程语句赘余，一个printf("到手工资：%d",pay)反复出现；好在最后都改正了，多余的语句也都删除了。第二个demo对现在的我而言，就比较难了，数组、指针的不熟悉，再加上编程思维不行，就只能默默地听东哥的思路，跟着一步步去做。
总之今晚还是有所收获，学会了数组的定义，简单运用；语句的精简等等。