十月末补充（？

出租车计价：

#include <stdio.h>
int main()
{
int x,m,y;
double z;
scanf("%d",&x);
scanf("%d",&m);

if(x>0&&x<=3)
{
y=10;
}
else if((x-3)>0&&(x-3)<=10)
{
y=10+2*(x-3);
}
else if(x>13)
{
y=3*(x-13)+10+2*10;

}
else
{
return 1;
}


if(m>=5)
{
z=(m/5.0)*2.0;
}
else
{
z=0.0;
}
double fee=y+z;             //注意把z、fee写成double类型的 才好四舍五入
printf("%.0f",fee);

return 0;
}

/*
#include <stdio.h>

int countdigit(int num, int digit);

int main() 
{
    int n;

    scanf("%d", &n);

    int count = assistant(n, 2);

    printf("%d", count);

    return 0;
}

int digit(int num, int digit) 
{
    int count = 0;

    if (num == 0 && digit == 0) 
{
        return 1; 
    }

    while (num > 0) 
{
        int last = num % 10;
        if (last == digit) 
{
            count++;
        }
        num /= 10; 
    }

    return count;
}
*/

/*
#include <stdio.h>

double real,imag;    //全局变量
void prod(double real1,double imag1,double real2,double imag2);
void add(double real1,double imag1,double real2,double imag2);
int main()
{
  double real1,real2,imag1,imag2;
  scanf("%lf %lf",&real1,&imag1);
  scanf("%lf %lf",&real2,&imag2);
  add(real1,imag1,real2,imag2);
  printf("%.2f+%.2fi\n",real,imag);
  prod(real1,imag1,real2,imag2);
  printf("%.2f+%.2fi\n",real,imag);
  return 0;
}

void prod(double real1,double imag1,double real2,double imag2)
{
  real=real1*real2-imag1*imag2;
  imag=real1*imag2+real2*imag1;
  return;
}
void add(double real1,double imag1,double real2,double imag2)
{
  real=real1+real2;
  imag=imag1+imag2;
  return;
}
*/


/*
#include <stdio.h>
int main()
{
int choice;
double cash=0.0;
double value;
void income(double number,double cash),explend(double number,double cash);

scanf("%d",&choice);
if(choice!=0)
{
if(choice==1||choice==2)
{
scanf("%lf",&value);
if(choice==1)
{
income(value);

}
else
{
expend(value);

}
printf("%.2f",cash);
scanf("%d",&choice);

}
else(choice==0)
{
return 1;
}
}
return 0;

} 

void income(double number,double cash)
{
return (cash+=number);
}
void explend(double number,double cash)
{
return (cash-=number);
}
*/

/*
#include <stdio.h>
int main()
{
  char ch;
  ch=getchar();
  while(ch!='\n')
  {
    if(ch>='A'&&ch<='Z')
    {
      ch=ch-'A'+'a';
    }
    else if(ch>='a'&&ch<='z')
    {
        ch=ch-'a'+'A';
}
      putchar(ch);
      ch=getchar();
    }
  }
  return 0;
} 

#include <stdio.h>
int main()
{
  char ch;
  while((ch=getchar())!=EOF)
  {
    if(ch>='A'&&ch<='Z')
    {
      ch=ch-'A'+'a';
    }
    else if (ch>='a'&&ch<='z')
    {
      ch=ch-'a'+'A';
    }
      putchar(ch);
    }
  }
  return 0;
} 
*/

/*
#include <stdio.h>
int main()
{
  int word,count;
  char ch;
  word=count=0;
  while((ch=getchar())!=EOF)
  {
    if(ch==' ')
    {
      word=0;
    }
    else if(word==0)
    {
      word=1;
      count++;
    }
  }
  printf("%d",count);
  return 0;
}

*/


#include <stdio.h>
#include <math.h>

double distance(double x1,double x2,double y1,double y2)
{
double dist;
dist = sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
return dist;
}


int main()
{
double x1,y1,x2,y2;

scanf("%lf %lf",&x1,&y1);
scanf("%lf %lf",&x2,&y2);

double dist=distance(x1,x2,y1,y2);
printf("%.2f",dist);

return 0;
}

原文地址：https://blog.csdn.net/Li_ling_8/article/details/143232616

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