实验2
Task1
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)); // 以当前系统时间作为随机种子 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 }
(1):生成一个在N1-N2的数值
(2):生成一个在1-N3的数值
(3):生成学号的随机数
Task2
1 #include <stdio.h> 2 #include <math.h> 3 4 int main() { 5 double a, b, c; 6 double delta, p1, p2; // 用于保存中间计算结果 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
1 #include<stdio.h> 2 int main() 3 { 4 char a; 5 while(scanf("%c",&a)!=EOF) 6 { 7 if(a=='g') 8 { 9 printf("gogogo\n"); 10 } 11 else if(a=='y'){ 12 printf("wait a minute\n"); 13 } 14 else if(a=='r'){ 15 printf("stop!\n"); 16 } 17 else{ 18 printf("something must went wrong\n"); 19 } 20 getchar(); 21 } 22 return 0
23 }
Task4
1 #include<stdio.h> 2 int main() 3 { 4 double a,total,max,min; 5 max=0; 6 min=20000; 7 total=0; 8 while(scanf("%lf",&a)!=EOF&&a!=-1) 9 { 10 if(a>max) 11 { 12 max=a; 13 } 14 if(a<min) 15 { 16 min=a; 17 } 18 total=total+a; 19 } 20 printf("最大开销=%lf\n",max); 21 printf("最低开销=%lf\n",min); 22 printf("总开销=%lf\n",total); 23 return 0; 24 }
Task5
1 #include<stdio.h> 2 int main(){ 3 int a,b,c; 4 while(scanf("%d%d%d",&a,&b,&c)!=EOF) 5 { 6 if(a+b<=c||a+c<=b||b+c<=a) 7 { 8 printf("不构成三角形\n"); 9 } 10 else 11 { 12 if(a==b&&a==c) 13 { 14 printf("等边三角形\n"); 15 } 16 else if(a==b||a==c||b==c) 17 { 18 printf("等腰三角形\n"); 19 } 20 else if(a*a+b*b==c*c||a*a+c*c==b*b||a*a==b*b+c*c) 21 { 22 printf("直角三角形\n"); 23 } 24 else 25 { 26 printf("普通三角形\n"); 27 } 28 } 29 } 30 return 0; 31 }
Task6
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include <time.h> 4 #define N 3 5 int main() 6 { 7 srand(time(NULL)); 8 int x,a,cnt; 9 a=rand()%30+1; 10 cnt=0; 11 while(cnt<N){ 12 scanf("%d",&x); 13 if(x<a){ 14 printf("早了\n"); 15 } 16 else if(x>a){ 17 printf("晚了\n"); 18 } 19 else if(x==a) 20 { 21 printf("猜中了!\n"); 22 return 0; 23 } 24 cnt+=1; 25 } 26 printf("下次加油,lucky day 是%d\n",a); 27 28 return 0; 29 }