1.4编程基础之逻辑表达式与条件分支

#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
int main()
{
int n;
cin>>n;
if (n>0)cout<<"positive";
if (n==0)cout<<"zero";
if (n<0)cout<<"negative";
    return 0;
}

#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
int main()
{
double n;
cin>>n;
printf("%.2lf",fabs(n));
    return 0;
}

#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
int main()
{
int n;
cin>>n;
if (n%2==1)cout<<"odd";
if (n%2==0)cout<<"even";
    return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
char a;
int n;
scanf("%c",&a);
n=a;
if (n%2==1)cout<<"YES"; else cout<<"NO";
return 0;
}

#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
int main()
{
int a,b;
cin>>a>>b;
if (a>b)cout<<‘>‘;
if (a==b)cout<<‘=‘;
if (a<b)cout<<‘<‘;
    return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int n;
cin>>n;
if (99>=n&&n>=10) cout<<1; else cout<<0;
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int a,b;
cin>>a>>b;
if (a>=10||b>=20) cout<<1; else cout<<0;
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int n;
cin>>n;
if (n%3==0&&n%5==0) cout<<"YES"; else cout<<"NO";
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int n;
cin>>n;
if (n%3==0&&n%5==0&&n%7==0) cout<<"3 5 7"; 
else if (n%3==0&&n%5==0) cout<<"3 5"; 
else if (n%5==0&&n%7==0) cout<<"5 7"; 
else if (n%3==0&&n%7==0) cout<<"3 7";
else if (n%3==0) cout<<‘3‘;
else if (n%5==0) cout<<‘5‘;
else if (n%7==0) cout<<‘7‘;
else cout<<‘n‘;
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int a,b;
cin>>a>>b;
if (a<60&&b>=60||a>=60&&b<60) cout<<‘1‘; else cout<<‘0‘;
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int n;
cin>>n;
if (n==1||n==3||n==5) cout<<"NO"; else cout<<"YES";
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
double n;
cin>>n;
if (50+n/3.0<n/1.2) cout<<"Bike"; else if (50+n/3.0==n/1.2) cout<<"All"; else cout<<"Walk";
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
double n;
cin>>n;
if(0<=n&&n<5) printf("%.3lf",-n+2.5);
else if(5<=n&&n<10) printf("%.3lf",2-1.5*(n-3)*(n-3));
else if(10<=n&&n<20) printf("%.3lf",n/2-1.5);
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int n,s;
char a;
cin>>n>>a;
s=8;
if(n>1000) if(n%500) s+=4*((n-1000)/500+1); else s+=4*(n-1000)/500;
if (a==‘y‘) s+=5;
cout<<s;
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int max(int a,int b)
{
    if (a>=b) return a; else return b;
}
int main()
{
int a,b,c;
cin>>a>>b>>c;
cout<<max(max(a,b),c);
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int a,b,c;
cin>>a>>b>>c;
if((a+b>c)&&(a+c>b)&&(b+c)>a) cout<<"yes";else cout<<"no";
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int a;
cin>>a;
if (a%4==0) 
if(a%100==0) 
{
if(a%3200!=0 && a%400==0)cout<<‘Y‘;
else cout<<‘N‘;
}
else cout<<‘Y‘;
else cout<<‘N‘; 
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int x,y;
cin>>x>>y;
if(1>=x&&x>=-1&&1>=y&&y>=-1) cout<<"yes"; else cout<<"no";
return 0;
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int a,b;
char s;
scanf("%d %d %c",&a,&b,&s);
if (s==‘+‘) cout<<a+b;
else if (s==‘-‘) cout<<a-b;
else if (s==‘*‘) cout<<a*b;
else if (s==‘/‘) if (b==0) cout<<"Divided by zero!"; else cout<<a/b;
else cout<<"Invalid operator!";
return 0;
}

#include<cstdio>
#include<math.h>
using namespace std;
int main()
{
double a,b,c,d;
scanf("%lf%lf%lf",&a,&b,&c);
d=b*b-4*a*c;
if(d<0)
{
if(b==0){
printf("x1=%.5lf+%.5lfi;",fabs(-b/(2*a)),(sqrt(-d))/(2*a));
printf("x2=%.5lf-%.5lfi",fabs(-b/(2*a)),(sqrt(-d))/(2*a));
}
else {
printf("x1=%.5lf+%.5lfi;",-b/(2*a),(sqrt(-d))/(2*a));
printf("x2=%.5lf-%.5lfi",-b/(2*a),(sqrt(-d))/(2*a));
}
}
else if(d==0)printf("x1=x2=%.5lf",-b/(2*a));
else printf("x1=%.5lf;x2=%.5lf",(-b+sqrt(d))/(2*a),(-b-sqrt(d))/(2*a));
return 0;    
}

#include<iostream>
#include<algorithm>
#include<set>
#include<cstdio>
using namespace std;
#define FOR(i,j,k) for(int i=j;i<=k;i++)
#define FORD(i,j,k) for(int i=j;i>=k;i--)
int main()
{
int n,x,y,ans;
cin>>n>>x>>y;
ans=y/x;
if(ans*x!=y) ans++;
if(ans>n) cout<<0; else cout<<n-ans;
return 0;
}