第四周作业

#include <stdio.h>
int main()
{
  float x,y;
  scanf("%f",&x);
  if(x==0)
  {
  y=0;
  printf("f(%.1f) = %.1f",x,y);
  }
  else
  { 
  y=1.0/x;
  printf("f(%.1f) = %.1f",x,y);
  }
  return 0;
}

#include <stdio.h>
int main()
{
  int A,B;
  scanf("%d %d",&A,&B);
  if(B>0)
  printf("%d/%d=%.2f",A,B,(float)(A*1.0/B*1.0));
  else if(B<0)
  printf("%d/(%d)=%.2f",A,B,(float)(A*1.0/B*1.0));
  else
  printf("%d/%d=Error",A,B);
  return 0;
}

#include <stdio.h>
int main()
{
  float a,b;
  scanf("%f",&a);
  if(a<=50&&a>0)
  printf("cost = %.2f",(float)(b=0.53*(a*1.00)));
  else if(a<=0)
  printf("Invalid Value!");
  else
  printf("cost = %.2f",(float)(b=0.53*50+(a*1.00-50)*0.58));
  return 0;
}

#include <stdio.h>
int main()
{
  float a;
  int b,c;
  scanf("%f %d",&a,&c);
  c=c/5.0;
  if(a<=3.0)
  printf("%d",b=10+2.0*c);
  else if(3.0<a&&a<=10.0)
  printf("%d",(int)(b=10+2*(a-3)+2.0*c));
  else
  printf("%d",(int)(b=(24+3*(a-10)+2.0*c)+0.5));
  return 0;
}