assigment programmg

SAlam kepada rakan2 sekalian... Ini ada lah coding assigment programming no2. No 1 tak wat lagi sebab tak faham soklan.... sekian.

#include<stdio.h>
#include<stdlib.h>

char letter_grade(int point);

int main()
{
    int points;
    char grade;
   
    printf("ENTER YOUR POINTS:");
    scanf("%d",&points);
   
    grade=letter_grade(points);
   
    printf("\nYour grade is %c\n\n",grade);
   
    system("PAUSE");

}

char letter_grade(int points)

{
     char grade;
    
     if(points>=80&&points<=100)
       grade='A';
       else
       if(points>=60&&points<=79)
       grade='B';
       else
       if(points>=50&&points<=59)
       grade='C';
       else
       if(points>=40&&points<=49)
       grade='D';
       if(points>=30&&points<=39)
       grade='E';
       else
       if(points<30)
       grade='F';
     
    
      
       return(grade);
}