可以幫我解答空格中的答安案是什麼嗎^^
1. 模擬產生6個介於3-49的樂透彩號碼並印出排序前後情形
請問第 3 空白處為何?
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define TOTALCARD __(1)__
#define HAND 6
int main()
{
int I,j, temp,point, card[HAND], sw[TOTALCARD];
long time_t;
srand(time(&time_t));
for (i=0; i<TOTALCARD; i++)
sw[i] = 0;
for (i=0; i<HAND; i++)
{
while (1)
{
point = rand() % TOTALCARD + __(2)__;
if (sw[point]==0) __(3)__;
}
card[i] = point;
sw[point] = 1;
}
printf("排序前: ");
for (i=0; i<HAND; i++)
printf("%3d", card[i]);
printf("\n");
for (i=0;I < HAND-1;i++)
for(j=i+1;j< HAND;j++)
if (card[i] __(4)__ card[j])
{
temp = card[i];
card[i] = card[j];
card[j] = __(5)__;
};
printf("排序後: ");
for (i=0; i<HAND; i++)
printf("%3d", card[i]);
printf("\n");
return 0;
}
2 個解答
- 慧雅Lv 59 年前最佳解答
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define TOTALCARD 47
#define HAND 6
int main()
{
int i,j, temp,point, card[HAND], sw[TOTALCARD];
long time_t;
srand(time(&time_t));
for (i=0; i<TOTALCARD; i++)
sw[i] = 0;
for (i=0; i<HAND; i++)
{
while (1)
{
point = rand() % TOTALCARD + 3;
if (sw[point]==0) break;
}
card[i] = point;
sw[point] = 1;
}
printf("排序前: ");
for (i=0; i<HAND; i++)
printf("%3d", card[i]);
printf("\n");
for (i=0;i < HAND-1;i++)
for(j=i+1;j< HAND;j++)
if (card[i] <card[j])
{
temp = card[i];
card[i] = card[j];
card[j] = temp;
};
printf("排序後: ");
for (i=0; i<HAND; i++)
printf("%3d", card[i]);
printf("\n");
system("pause");
//return 0;
}
- 9 年前
寫在前面：
1. 這個題目用填空題沒辦法得到一個符合要求卻沒有錯誤的答案。
2. 樂透號碼是從1開始，為什麼要從3開始，是題目寫錯？還是有什麼用意？
3. 你的原始程式碼裡面，變數i 的大小寫不分，以下已修正。程式也重新對齊。
最接近的答案是以下這個，排序由小到大。
第三個空格要填的是 break
==============
#include
#include
#include
#define TOTALCARD 47
#define HAND 6
int main()
{
int i,j, temp,point, card[HAND], sw[TOTALCARD];
long time_t;
srand(time(&time_t));
for (i=0; i
sw[i] = 0;
for (i=0; i
{
while (1)
{
point = rand() % TOTALCARD + 3;
if (sw[point]==0) break;
}
card[i] = point;
sw[point] = 1;
}
printf("排序前: ");
for (i=0; i
printf("%3d", card[i]);
printf("\n");
for (i=0;i < HAND-1;i++)
for(j=i+1;j< HAND;j++)
if (card[i] > card[j])
{
temp = card[i];
card[i] = card[j];
card[j] = temp;
};
printf("排序後: ");
for (i=0; i
printf("%3d", card[i]);
printf("\n");
printf("=============================\n");
return 0;
}
==============
這種寫法的問題在於以下四行互相抵觸：
#define TOTALCARD 47
int sw[TOTALCARD];
point = rand() % TOTALCARD + 3;
sw[point] = 1; // 當point = 47, 48, 49 時會超出原先的陣列 (合法範圍為0~46)
所以在執行上可能會出問題。之所以說『可能』是因為超出陣列範圍所引發的反應是不可預期的，有可能永遠跑不出 47, 48, 49，也有可能會跑出47, 48, 49，但是多跑幾次之後就會出現錯誤。
如果不受限於空格的話，以下是一個沒有語法錯誤的版本，可以正確地產生3~49的號碼：
（修改地方以紅色標示）
#include
#include
#include
#define TOTALCARD 47
#define HAND 6
int main()
{
int i,j, temp,point, card[HAND], sw[TOTALCARD];
long time_t;
srand(time(&time_t));
for (i=0; i
sw[i] = 0;
for (i=0; i
{
while (1)
{
point = rand() % TOTALCARD;
if (sw[point]==0) break;
}
sw[point] = 1;
card[i] = point+3;
}
printf("排序前: ");
for (i=0; i
printf("%3d", card[i]);
printf("\n");
for (i=0;i < HAND-1;i++)
for(j=i+1;j< HAND;j++)
if (card[i] > card[j])
{
temp = card[i];
card[i] = card[j];
card[j] = temp;
};
printf("排序後: ");
for (i=0; i
printf("%3d", card[i]);
printf("\n");
printf("=============================\n");
return 0;
}
