算法笔记codeup-Contest100000568

A

#include <stdio.h>
int main()
{
    int a=;
    int sum=;
    while(a)
    {
        sum=sum+a;
        a--;
    }
    printf("%d",sum);
    return ;
}

B 差不多

C

#include <stdio.h>
int main()
{
    int a=;
    int sum=;
    for (;a>=;a--) {
        /* code */
        sum+=a;
    }
    printf("%d",sum);
}

D

#include <stdio.h>
int main()
{
    int a=;
    int sum=;
    scanf("%d",&a);
    for (;a>=;a--) {
        /* code */
        sum+=a;
    }
    printf("%d",sum);
}

E

#include <stdio.h>
int main()
{
    int a=;
    int sum=;
    for (;a<=;a++) {
        /* code */
        sum+=a;
        if(sum>)
        break;
    }
    printf("%d",a);
}

F

 #include <stdio.h>

 int main()
 {
     int i=;
     for(i=;i<=;i++)
     {
         printf("%3d",*i);
         printf("%3d",*i);
         printf("%3d",*i);
         printf("%3d",*i);
         printf("%3d\n",*i);
     }

 } 

G

#include<stdio.h>
#include<math.h>
int main()
{
int sign=;
double pi=0.0,n=1.0,term=1.0;
while(fabs(term)>=1e-)
{
pi=pi+term;
n=n+;
sign=-sign;
term=sign/n;
}
pi=pi*;
printf("PI=%10.8f\n",pi);
return ;
}

H

#include <stdio.h>
#include <math.h>
 int main()
 {
      int A=;
     int B=;
     int C=;
     int count=;
     int init=;
     int chushu=;
     int yushu=;

     scanf("%d",&count);
     chushu=count/;
     yushu=count%;
     if(count==||count==)
     {
         printf("");
     }
     else{
         for(;init<chushu;init++)
         {
             C=A+B;
             A=B+C;
             B=C+A;
         }
         switch(yushu)
         {
             case :
             printf("%d",C);
             break;
            case :
             printf("%d",A);
             break;
            case :
             printf("%d",B);
             break;
          }
     }

 } 

I

#include <stdio.h>
#include <math.h>
 int main()
 {
      double A=1.0;
     double B=2.0;
     int count=;
     int temp=;
     int init=;
     double sum=0.0; 

     for(;init<;init++)
     {
         sum+=B/A;
         temp=B;
         B=A+B;
         A=temp;
     }

     printf("%.6lf",sum);

 }