Performance grading

#include "stdio.h"
void main()
{
  int score;
  the printf ( " Enter fractional \ n- " );
  scanf("%d",&score);
  if(score<60)
  {
   printf("the score is E");
  }
  else if((score>60||score==60)&&score<70)
  {
   printf("the score is D");
  }
  else if((score>70||score==70)&&score<80)
  {
   printf("the score is C");
  }
  else if((score>80||score==80)&&score<90)
  {
      printf("B");

  }
  else
  {
   printf("A");
  }
}