Write a Python program to calculate the grade based on marks: >=90: A, >=80: B, >=70: C, >=60: D, else: F.
A float representing marks (0 to 100).
Print the corresponding grade letter (A, B, C, D, or F).
0 <= Marks <= 100
85
B
Use cascading if-elif-else ladders to check grading thresholds.
# Write your code here
Embedded systems rely on efficient low-level programming to interact directly with hardware. In this course, you will learn how to write practical Embedded C programs used in real microcontroller-based systems. Rather than focusing only on theory, this course follows a practice-driven approach. Each lesson includes hands-on coding exercises that simulate real firmware development tasks used