grade checking program

#include <stdio.h>

int main() {
     int grade;
    printf("enter your rating\n");
    scanf("%d",&grade);
    
    if( grade > 90 || grade ==100 || grade ==90){
        printf("your rating is A\n");
    }
    else if ( grade > 80 && grade < 90 || grade ==80){
         printf("your rating is B\n");
    }
else if(grade > 70 && grade < 80 || grade ==70) {
    printf("your rating is C\n");
}
else if(grade > 60 && grade < 70 || grade ==60){
     printf("your rating is D\n");
}
else if(grade < 70){
     printf("your rating is F\n");
}
return 0;
}