作业2
实验任务1
源代码
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<time.h> 4 5 #define N 5 6 #define N1 397 7 #define N2 476 8 #define N3 21 9 10 int main(){ 11 int cnt; 12 int random_major, random_no; 13 14 srand(time(NULL)); 15 16 cnt=0; 17 while(cnt<N){ 18 random_major=rand()%2; 19 20 if(random_major){ 21 random_no=rand()%(N2-N1+1)+N1; 22 printf("20248329%04d\n",random_no); 23 } 24 else { 25 random_no=rand()%N3+1; 26 printf("20248395%04d\n",random_no); 27 } 28 29 cnt++; 30 } 31 32 return 0; 33 }
问题一：生成N1到N2之间的随机整数
问题二：生成1到N3之间的随机整数
问题三：生成随机数
实验任务2
源代码
1 #include<stdio.h> 2 #include<math.h> 3 4 int main(){ 5 double a,b,c; 6 double delta,p1,p2; 7 8 while(scanf("%lf%lf%lf",&a,&b,&c) !=EOF){ 9 if(a==0){ 10 printf("a=0,invalid input\n"); 11 continue; 12 } 13 14 delta=b*b-4*a*c; 15 p1=-b/2/a; 16 p2=sqrt(fabs(delta))/2/a; 17 18 if(delta==0) 19 printf("x1=x2=%.2g\n",p1); 20 else if(delta>0) 21 printf("x1=%.2g,x2=%.2g\n",p1+p2,p1-p2); 22 else { 23 printf("x1=%.2g+%.2gi,",p1,p2); 24 printf("x2=%.2g-%.2gi\n",p1,p2); 25 } 26 } 27 28 return 0; 29 }
实验任务3
源代码
1 #include <stdio.h> 2 3 int main() { 4 char c; 5 int result; 6 7 while (1) { 8 result = scanf("%c", &c); 9 10 if (result == EOF) { 11 printf("程序结束\n"); 12 break; 13 } 14 15 getchar(); 16 17 if (c == 'r') { 18 printf("stop!\n"); 19 } else if (c == 'g') { 20 printf("go go go\n"); 21 } else if (c == 'y') { 22 printf("wait a minute\n"); 23 } else { 24 printf("something must be wrong...\n"); 25 } 26 } 27 28 return 0; 29 }
运行结果
实验任务4
源代码
1 #include <stdio.h> 2 3 int main() { 4 float a, b = 0.0, c = 20000.0, d = 0.0; 5 int firstInput = 1; 6 7 printf("请输入一天内的若干笔开销，输入-1时终止程序：\n"); 8 9 while (1) { 10 scanf("%f", &a); 11 12 if (a == -1) { 13 break; 14 } 15 16 d += a; 17 18 if (firstInput || a > b) { 19 b = a; 20 firstInput = 0; 21 } 22 23 if (a < c) { 24 c = a; 25 } 26 } 27 28 printf("一天内最高一笔开销：%.1f\n", b); 29 printf("一天内最低一笔开销：%.1f\n", c); 30 printf("一天总开销：%.1f\n", d); 31 32 return 0; 33 }
实验结果
实验任务5
源代码
1 #include<stdio.h> 2 #include<math.h> 3 4 int main(){ 5 int a,b,c; 6 int result; 7 8 while(1){ 9 result = scanf("%d %d %d", &a, &b, &c); 10 11 if (result == EOF) { 12 printf("程序结束\n"); 13 break; 14 } 15 16 if (a + b > c && a + c > b && b + c > a) { 17 if (a == b && b == c) { 18 printf("等边三角形\n"); 19 } else if (a == b || a == c || b == c) { 20 if (a*a + b*b == c*c || a*a + c*c == b*b || b*b + c*c == a*a) { 21 printf("等腰直角三角形\n"); 22 } else { 23 printf("等腰三角形\n"); 24 } 25 } else if (a*a + b*b == c*c || a*a + c*c == b*b || b*b + c*c == a*a) { 26 printf("直角三角形\n"); 27 } else { 28 printf("普通三角形\n"); 29 } 30 } else { 31 printf("不能构成三角形\n"); 32 } 33 } 34 35 return 0; 36 }
实验结果
实验任务6
源代码
1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <time.h> 4 5 int main() { 6 int luckyDay, guess;
7 int attempts = 3;
8 srand(time(0)); 9 luckyDay = rand() % 30 + 1; 10 11 printf("你有3次机会猜测11月的lucky day（1-30之间）。\n"); 12 13 while (attempts > 0) { 14 printf("请输入你猜测的日期："); 15 scanf("%d", &guess); 16 17 if (guess < luckyDay) { 18 printf("你猜的日期早了。\n"); 19 } else if (guess > luckyDay) { 20 printf("你猜的日期晚了。\n"); 21 } else { 22 printf("恭喜你！你猜中了！\n"); 23 return 0; 24 } 25 26 attempts--; 27 } 28 29 printf("很遗憾，你没有猜中。11月的lucky day是：%d\n", luckyDay); 30 31 return 0; 32 }
运行结果
