[C] 大樂透開獎

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(){
    int lot[49], choose[7], min = 1, max = 49, num = 7;
    int max_dim = max-min+1, choice, i;
   
    for(i=0; i<max_dim; i++){
        lot[i] = i+min;
    }

    srand((unsigned)time(NULL));
   
    for(i=0; i<num; i++){
        choice = rand()%max_dim;
        choose[i] = lot[choice];
        lot[choice] = lot[max_dim-1];
        max_dim--;
    }
   
    printf("\n 本期大樂透 電腦選號 號碼如下：\n\n");
   
    for(i=0; i<num-1; i++){
        printf(" %d", choose[i]);
    }
 
    printf("\n\n 特別號： %d \n\n\n", choose[num-1]);  
 
    return 0;
} 

[C] 綜合所得稅試算

/*
 
說明
 
請根據綜合所得稅速算公試表，求出使用者輸入綜合所得淨額後，印出稅率、稅金、累進差額還有今年應納稅額。
 
Input Format
 
今年所得
 
Output Format
 
所得淨額：
稅額：
稅金：
累進差額：
今年應繳：
 
Sample Input
 
1230000
 
Sample Output
 
income 1230000
tax rate 21%
tax 258300
discount 105100
taxpay 153200
 
*/
 
#include <stdio.h>
 
int main()
{
    int income, discount;
    double taxrate;
 
    scanf("%d", &income);
 
    if(income>=0 && income<=370000){
        taxrate = 0.06;
        discount = 0;
    }
 
    else if(income>370000 && income<=990000){
        taxrate = 0.13;
        discount = 25900;
    }
 
    else if(income>990000 && income<=1980000){
        taxrate = 0.21;
        discount = 105100;
    }
 
    else if(income>1980000 && income<=3720000){
        taxrate = 0.3;
        discount = 283300;
    }
 
    else if(income>3720000){
        taxrate = 0.4;
        discount = 655300;
    }
 
    else{
        printf("input error\n");
    }
 
    printf("income %d\n", income);
    printf("tax rate %.0f%%\n", taxrate*100);
    printf("tax %.0f\n", income*taxrate);
    printf("discount %d\n", discount);
    printf("taxpay %.0f\n", income*taxrate-discount);
 
    return 0;
}

[C] 猜數字遊戲

/*
 
說明
 
猜數字遊戲
讓系統隨機生成一數字介於1到5之間
使用者輸入一數字猜此數字是什麼
猜對的話輸出”猜對了”
猜錯則反之輸出”猜錯了”
 
Input Format
 
猜的數字1-5
 
Output Format
 
猜對的話輸出”你猜對了 答案正是 x”
猜錯則反之輸出”猜錯了了喔 其實是 x”
 
Sample Input
 
3
 
Sample Output
 
bingo answer is 3
 
Sample Input
 
3
 
Sample Output
 
wrong answer, answer is 5
 
*/
 
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
int main()
{
    int guess, keyin;
    srand((unsigned)time(NULL));
    guess = rand()%5+1;
   
    scanf("%d", &keyin);
   
    if(guess == keyin)
        printf("bingo answer is %d\n", guess);
       
    else
        printf("wrong answer, answer is %d\n", guess);
       
    return 0;
}