1.实验任务1
#include <math.h> #include <stdio.h> int main() { float a, b, c, x1, x2; float delta, real, imag; printf("Enter a, b, c: "); while(scanf("%f%f%f", &a, &b, &c) != EOF) { if(a == 0) printf("not quadratic equation. "); else{ delta = b*b - 4*a*c; if(delta >= 0) { x1 = (-b + sqrt(delta)) / (2*a); x2 = (-b - sqrt(delta)) / (2*a); printf("x1 = %.2f, x2 = %.2f ", x1, x2); } else { real = -b/(2*a); imag = sqrt(-delta) / (2*a); printf("x1 = %.2f + %.2fi, x2 = %.2f - %.2fi ", real, imag, real, imag); } } printf("Enter a, b, c: "); } return 0; }
2.实验任务2
#include <stdio.h> #include <stdlib.h> #include <time.h> #define N 5 int main() { int x, n; srand(time(0)); n = 0; do { n++; x = rand()%10; printf("%3d", x); }while(n<N); printf(" "); return 0; }
3.实验任务3
#include<stdio.h> #include<math.h> int isprime(int n); int main() { int i,m=0,t=0; for(i=101;i<=200;i++) { if(isprime(i)) { m=m+1; t++; if(t%5==0) printf("%4d ",i); else printf("%4d",i);} }printf(" "); printf("101~200之间共有%d个素数 ",m); return 0; } int isprime(int n) { int k; for(k=2;k<=sqrt(n);k++) if(n%k==0) return 0; return 1; }
4.实验任务4
以a=s%10;(a%2==1)取奇数
以t=0;t=a*pow(10,n-1)+t实现高位与低位问题
#include<stdio.h> #include<math.h> int main(){ long int s,a,n=0,t=0; printf("Enter a number:"); while(scanf("%ld",&s)!=EOF){ do{ a=s%10; if(a%2==1){ n++; t=a*pow(10,n-1)+t; } s=s/10; }while(s!=0); printf("new number is:%ld ",t); printf("Enter a number:"); t=0; n=0; } return 0; }
5.实验任务5
#include<stdio.h> int main(){ int n,t,j,b; float s=0,a; printf("Enter n(1~10):"); while(scanf("%d",&n)!=EOF){ float s=0; int j=1; int b=-1; for(t=1;t<=n;t++) { j=j*t; b=b*(-1); a=b*1.0/j; s=s+a; } printf("n=%d,s=%f ",n,s); printf(" Enter n(1~10):"); } return 0; }
6.实验任务6
#include<stdio.h> #include<stdlib.h> #include<time.h> int main(){ int x,date,i,a=0; srand(time(0)); date=rand()%31; printf("猜猜2020年12月哪一天会是你的lucky day 开始喽,你有三次机会,猜吧(1~31):"); for(i=1;i<=3;i++){ scanf("%d",&x); if(x>date)printf(" 你猜的日期晚了,lucky day悄悄溜到前面啦"); else if(x<date) printf(" 你猜的日期早了,lucky day还没到呢"); else { a=1; printf(" 你猜中了!"); break; }; if(i!=3)printf(" 再猜(1~31): "); } if(a==0)printf(" 次数用完啦。偷偷告诉你:12月,你的lucky day是%d号",date); return 0; }