Grade

#include <stdio.h>
int main()
{int marks;
printf("Enter your marks:");
scanf("%d",&marks);
if(marks<50){
    printf("Grade 'F'",marks);
}
else if (marks>=50&&marks<60){
printf("Grade 'D'",marks);
}
else if (marks>=60&&marks<70){
    printf("Grade C");
}
else if (marks>=70&&marks<80){
    printf("Grade 'B'");
}
else if (marks>=80&&marks<90){
    printf("Grade 'A'");
}
else
printf("Grade A+");
return 0;
}