PTA題目的處理（二）

#include <stdio.h>
int main()
{
  float x,y;
  scanf("%f",&x);
  if(x==0)
  {
    y=0;
    printf("f(%.1f) = %.1f",x,y);
  }
  else
  {
    y=1/x;
    printf("f(%.1f) = %.1f",x,y);
  }
  return 0;
}

#include <stdio.h>
int main()
{
  signed int A,B;
  double C;
  scanf("%d %d",&A,&B);
  if(B==0)
  {
    printf("%d/%d=Error",A,B);
  }
  else if(B>0)
  {
    C=(double)A/B;
    printf("%d/%d=%.2f",A,B,C);
  }
  else
  {
    C=(double)A/B;
    printf("%d/(%d)=%.2f",A,B,C);
  }
  return 0;
}

#include <stdio.h>
#define sold 26.5
int main()
{
  float consumption,cost;
  scanf("%f",&consumption);
  if(consumption<=50&&consumption>=0)
  {
    cost=consumption*0.53;
    printf("cost = %.2f",cost);
  }
  else if(consumption<0)
  {
    printf("Invalid Value!");
  }
  else
  {
    cost=(consumption-50)*0.58+sold;
    printf("cost = %.2f",cost);
  }
}

#include <stdio.h>
#define price1 10.0f
#define price2 24.0f
int main()
{
  float distance,cost1,cost2;
  int minute;
  scanf("%f %d",&distance,&minute);
  if(distance<=3.0f)
  {
    cost1=price1;
  }
  else if(distance<=10.0f)
  {
    cost1=price1+(distance-3)*2.0f;
  }
  else
  {
    cost1=price2+(distance-10)*3;
  }
  if(minute>=5)
  {
    if((minute%5)==0)
    {
      cost2=cost1+(minute/5)*2.0f;
      printf("%.0f",cost2);
    }
    else
    {
      cost2=cost1+(minute/5)*2;
      printf("%.0f",cost2);
    }
  }
  else
  {
    cost2=cost1;
    printf("%.0f",cost2);
  }
  return 0;
}