Read marks out of 100 and print the grade:
| Marks | Grade |
|---|---|
| 80 to 100 | A+ |
| 70 to 79 | A |
| 60 to 69 | B |
| 50 to 59 | C |
| 40 to 49 | D |
| 0 to 39 | F |
Print invalid for marks below 0 or above 100.
What to build
A chain of conditions with seven possible results.
Requirements
- Check for invalid marks first.
- Print the grade from the table above.
Input
One whole number.
Output
The grade, or invalid.
Constraints
The marks can be any whole number that fits in an int.
Example
Input:
85
Output:
A+
Why it works
Once the invalid marks are excluded, testing from the highest band downward means each test need only give the lower limit.
Examples
Example 1 · Input
85
Expected output
A+
Example 2 · Input
39
Expected output
F
Hints
Hint 1
Check from the highest band down with else if.
Hint 2
Marks outside 0 to 100 should print invalid; test that first.
Solution
Show one correct solution (try it yourself first)
#include <stdio.h>
int main(void) {
int marks;
scanf("%d", &marks);
if (marks < 0 || marks > 100) printf("invalid\n");
else if (marks >= 80) printf("A+\n");
else if (marks >= 70) printf("A\n");
else if (marks >= 60) printf("B\n");
else if (marks >= 50) printf("C\n");
else if (marks >= 40) printf("D\n");
else printf("F\n");
return 0;
}