【openjudge 计算概论（A）】[基础编程练习2]

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1:求平均年龄

#include<cstdio>using namespace std;int main(){int n;scanf("%d",&n);int ans=0;for(int i=1;i<=n;++i)  { int x; scanf("%d",&x); ans+=x; }printf("%.2lf\n",(double)ans/(double)n);return 0;}

2:计算书费

#include<cstdio>using namespace std;double d[10]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};int n;int main(){scanf("%d",&n);while(n--) { double sum=0; for(int i=0;i<10;++i)  {  int x;  scanf("%d",&x);  sum+=((double)x*d[i]);  }printf("%.2lf\n",sum); }return 0;}

3:计算三角形面积

[不明白我写的叉积为什么wa]

#include<iostream>#include<cstdio>#include<cstring>#include<cmath>#include<algorithm>using namespace std;double x[4],y[4],a,b,c,p;double ans;int main(){    cin>>x[1]>>y[1]>>x[2]>>y[2]>>x[3]>>y[3];    a=sqrt((x[2]-x[1])*(x[2]-x[1])+(y[2]-y[1])*(y[2]-y[1]));    b=sqrt((x[2]-x[3])*(x[2]-x[3])+(y[2]-y[3])*(y[2]-y[3]));    c=sqrt((x[1]-x[3])*(x[1]-x[3])+(y[1]-y[3])*(y[1]-y[3]));    p=(a+b+c)/2;    ans=sqrt(p*(p-a)*(p-b)*(p-c));    printf("%.2lf\n",ans);}

4:骑车与走路

#include<cstdio>using namespace std;int main(){int n;scanf("%d",&n);while(n--) { int len; scanf("%d",&len); double tmw=(double)len/1.2; double tmb=(double)len/3.0+27.0+23.0; if(tmw<tmb) printf("Walk\n");  else   if(tmw>tmb) printf("Bike\n");    else printf("All\n"); }return 0;}

5:点和正方形的关系

#include<cstdio>using namespace std;int main(){int x,y;while(scanf("%d%d",&x,&y)==2) { if(x>=-1&&x<=1&&y>=-1&&y<=1) printf("yes\n");  else printf("no\n"); }return 0;}

6:数组逆序重放

#include<cstdio>using namespace std;int a[110],n;int main(){ int i; scanf("%d",&n); for (i=1;i<=n;i++)  scanf("%d",&a[i]); for (i=n;i>0;i--)  printf("%d ",a[i]); return 0;}

7:整数的个数

#include<cstdio>using namespace std;int main(){int n;scanf("%d",&n);int t1=0,t2=0,t3=0;for(int i=1;i<=n;++i) { int x; scanf("%d",&x); if(x==1) t1++; if(x==5) t2++; if(x==10) t3++; }printf("%d\n%d\n%d\n",t1,t2,t3);return 0;}

8:1的个数

#include<cstdio>using namespace std;int main(){int n;scanf("%d",&n);while(n--) { int x,tot=0; scanf("%d",&x); while(x)  {  if(x%2) tot++;  x/=2;  }printf("%d\n",tot); }return 0;}

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