task1
点击查看代码
#include<stdio.h>
#include<stdlib.h>
#include<math.h>#define N 5
#define N1 397
#define N2 476
#define N3 21int main()
{int cnt;int random_no,random_major;srand(time(NULL));cnt = 0;while (cnt<N){random_major=rand()%2;if(random_major){random_no = rand() % (N2 - N1 + 1) + N1;printf("20248329%04d\n", random_no);}else{random_no = rand() % N3 + 1;printf("20248395%04d\n", random_no);}cnt++;}return 0;
}
21 抽397到476的同学
25 0 21
随机抽取在座的5名同学
task2
点击查看代码
#include <stdio.h>
#include <math.h>int main() {double a, b, c;double delta, p1, p2; while(scanf("%lf%lf%lf", &a, &b, &c) != EOF) {if(a == 0) {printf("a = 0, invalid input\n");continue;}delta = b*b - 4*a*c;p1 = -b/2/a;p2 = sqrt(fabs(delta))/2/a;if(delta == 0)printf("x1 = x2 = %.2g\n", p1);else if(delta > 0)printf("x1 = %.2g, x2 = %.2g\n", p1+p2, p1-p2);else {printf("x1 = %.2g + %.2gi, ", p1, p2);printf("x2 = %.2g - %.2gi\n", p1, p2);}}return 0;
}
task3
点击查看代码
#include<stdio.h>int main()
{char a;while( (scanf("%c",&a)) != EOF){getchar();if ( a == 'g' || a == 'G')printf("go go go\n");else if( a == 'y' || a == 'Y')printf("wait a minute\n");else if( a == 'r' || a == 'R')printf("stop!\n");elseprintf("something must be wrong...\n");}return 0;
}
================================================================================================
task4
点击查看代码
#include<stdio.h>int main()
{double pay , sum = 0.0 , max=0.0 , min=20000.0;printf("输入今天的开销直至-1终止\n");while((scanf("%lf",&pay)) != EOF ){if(pay == -1)break;sum = sum + pay;if(pay > max)max = pay;if(pay < min)min = pay;}printf("最高一笔开销%lf\n最低一笔开销%lf\n一天总开销%lf\n",max,min,sum);
}
点击查看代码
#include<stdio.h>int main()
{int a,b,c;while((scanf("%d %d %d",&a,&b,&c)) != EOF){if (a+b<c || a+c<b || b+c<a)printf("不能构成三角形\n");else if (a == b || a == c || b == c)if(a == b && a ==c && b == c)printf("等边三角形\n");elseprintf("等腰三角形\n");else if ( a*a + b*b == c*c || a*a + c*c == b*b || b*b + c*c == a*a)printf("直角三角形\n");else printf("普通三角形\n");}return 0;
}
=============================================================================================================
task6
点击查看代码
#include<stdio.h>#define N 1
#define N1 30int main()
{int luck,i,gus;i = 0;srand(time(NULL));luck = rand() % ( N1 - N + 1) + 1;printf("开始喽，你有三次机会，猜吧（1~30）：");while ( i < 3 ){scanf("%d",&gus);if (gus < luck)printf("你猜的日期早了，你的luck日在后面哦\n");else if(gus = luck){printf("哇猜中了：）");break;}elseprintf("你猜的日期晚了，你的luck日在前面哦\n");if (i < 2)printf("在猜（1~30）：");else if(i == 2)printf("次数用完了。偷偷告诉你，11月你的luck day是%d号哦",luck);i++;}return 0;}
