实验2
task1
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 }
问题回答
Q1:line21为了随机生成N1-N2的整数
Q2:line25为了随机生成1-N3的整数
Q3:该程序是为了随机生成该专业的五个学号。
task2
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 }
task3
源代码
1 #include<stdio.h> 2 int main() 3 { 4 char light; 5 while(scanf("%c",&light)!=EOF){ 6 getchar(); 7 if(light == 'r'){ 8 printf("stop!\n"); 9 } 10 else if(light == 'g'){ 11 12 printf("gogogo\n"); 13 } 14 else if(light == 'y'){ 15 printf("wait a minute\n"); 16 } 17 else{ 18 printf("something must be wrong\n"); 19 } 20 } 21 return 0; 22 }
task4
源代码
1 #include<stdio.h> 2 int main() 3 { 4 double money, max=0,min=20000,total=0; 5 printf("输入今日开销，直到输入-1终止:\n"); 6 7 while(scanf("%lf",&money),money!=-1){ 8 if(money>max) 9 max = money; 10 else 11 min = money; 12 getchar(); 13 total = total+money; 14 } 15 printf("今日累计消费总额:%lf\n",total); 16 printf("今日最高一笔开销:%lf\n",max); 17 printf("今日最低一笔开销:%lf\n",min); 18 return 0; 19 }
task5
源代码
1 #include<stdio.h> 2 int main() 3 { 4 int a,b,c; 5 while(scanf("%d %d %d",&a,&b,&c)!=EOF){ 6 7 if(a+b>c&&b+c>a&&a+c>b){ 8 if(a==b&&b==c) 9 printf("等边三角形\n"); 10 else if(a==b||b==c||a==c) 11 printf("等腰三角形\n"); 12 else if(a*a+b*b==c*c||b*b+c*c==a*a||a*a+c*c==b*b) 13 printf("直角三角形\n"); 14 else 15 printf("普通三角形\n"); 16 } 17 else 18 printf("不能构成三角形\n"); 19 } 20 return 0; 21 }
task6
源代码
1 #include<stdio.h> 2 #include<time.h> 3 int main() 4 { 5 printf("猜猜2024年11月中哪一天会是你的lucky day吧\n"); 6 printf("开始猜咯，你有三次机会，猜吧（1~30）：\n"); 7 srand(time(NULL)); 8 int luckyday = rand() % 30 + 1; 9 int date; 10 int chance = 1; 11 12 while(chance<=3){ 13 scanf("%d",&date); 14 if(date<luckyday){ 15 16 printf("你猜的日期早了，你的lucky day还没到呢\n"); 17 if (chance<=3) 18 printf("再猜（1~30）：\n"); 19 } 20 else if(date>luckyday){ 21 22 printf("你猜的日期晚了，你的lucky day还在前面哦\n"); 23 if(chance<=3) 24 printf("再猜（1~30）：\n"); 25 } 26 else if(date==luckyday){ 27 printf("哇，猜中了!"); 28 break; 29 } 30 chance++; 31 } 32 if ( chance== 4) 33 printf("次数用光啦。偷偷告诉你，11 月你的lucky day是%d号", luckyday); 34 35 36 return 0; 37 }
