Grading System | C

*Take a name and  mark of a subject as input from user and print grade according to the chart bellow.

Solution:

#include <stdio.h>

int main() {
    int b;
    char a[20];
    printf("What is your name?\n");
    gets(a);
    printf("What is your mark?\n");
    scanf("%d",&b);
    if(b>=80 && b<=100){
        printf("Outstanding! You've got A+.\n");
    }
    else if(b<=79 && b>=75){
        printf("Excellent! You've got A.\n");
    }
    else if(b<=74 && b>=70){
        printf("Very Good! You've got A-\n.");
    }
    else if(b<=69 && b>=65){
        printf("Good! You've got B+.\n");
    }
    else if(b<=64 && b>=60){
        printf("You've got B.Try to do better.\n");
    }
    else if(b<=59 && b>=55){
        printf("You've got B-.Try to do better.\n");
    }
    else if(b<=54 && b>=50){
        printf("You've got C+. Try to do better.\n");
    }
    else if(b<=49 && b>=45){
        printf("You've got C. Try to do better.\n");
    }
    else if(b<=44 && b>=40){
        printf("You've got D. Try to do better.\n");
    }
    else if(b<=39 && b>=0){
        printf("Sorry! You've failed. But don't loose hope. Try again.\n");
    }
    else printf("Invalid mark! Please enter a valid mark.\n");
    return 0;
}