#include <stdio.h> #include <stdlib.h> /*包含隨機數生成函數*/ #include <time.h>int main() {int right();int wrong();int num1, num2, op, result1, result2;srand(time(NULL)); /*隨機數種子優化*/ num1 = rand() % 10;num2 = rand() % 10;op = rand() * 4 / (RAND_MAX+1);switch(op){case 0: printf("%d + %d = ?\n", num1, num2);scanf("%d", &result1);if(num1 + num2 == result1)printf("you are right\n");else printf("you are wrong\n");break;case 1: printf("%d - %d = ?\n", num1, num2);scanf("%d", &result1);if(num1 - num2 == result1)printf("you are right\n");else printf("you are wrong\n");break;case 2: printf("%d * %d = ?\n",num1,num2);scanf("%d", &result1);if(num1 * num2 == result1)printf("you are right\n");else printf("you are wrong\n");break;case 3: printf("%d / %d = ?\n", num1, num2);scanf("%d", &result1);printf("余數為？\n");scanf("%d", &result2);if(num1 == num2 * result1 + result2)printf("you are right\n");else printf("you are wrong\n");break;}return 0;}

啟發
1.
需求隨機數 為整數10以內
rand（）% 10
*rand（） 10 / （RAND_MAX+1）**實現
2.
由于計算機生成的是偽隨機數，可以采用srand來設置隨機數的種子，
而種子C語言可以采用獲取系統時間time（NULL）來實現
故
**srand（time（NULL））**來使得隨機數種子初始化

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