plot.py

import matplotlib.pyplot as plt

# Reading data from the file generated by C
try:
    with open("output.txt", "r") as file:
        data = file.read().split()
        
        # Mapping data to variables
        fifo_faults = int(data[0])
        lru_faults = int(data[1])
        first_frag = int(data[2])
        best_frag = int(data[3])
        worst_frag = int(data[4])
except FileNotFoundError:
    print("Error: output.txt not found. Run the C program first.")
    exit()

# --- Plot 1: Page Faults ---
plt.figure(figsize=(10, 5))
plt.subplot(1, 2, 1) # Side-by-side plots
plt.bar(['FIFO', 'LRU'], [fifo_faults, lru_faults], color=['blue', 'green'])
plt.ylabel("Page Faults")
plt.title("Page Replacement Comparison")

# --- Plot 2: Fragmentation ---
plt.subplot(1, 2, 2)
# FIX: Removed the quotes so it uses the variables, not strings
plt.bar(['First Fit', 'Best Fit', 'Worst Fit'], [first_frag, best_frag, worst_frag], color=['orange', 'red', 'purple'])
plt.ylabel("Total Fragmentation")
plt.title("Memory Allocation Comparison")

plt.tight_layout()

# --Page Table--
pages = []
frames = []
valids = []

with open("output.txt", "r") as file:
    lines = file.readlines()

# Skip first line (summary)
for line in lines[1:]:
    parts = line.strip().split()
    
    # Only process lines with exactly 3 elements
    if len(parts) != 3:
        continue

    # Convert values
    p, f, v = int(parts[0]), int(parts[1]), int(parts[2])
    pages.append(p)
    frames.append(f)
    valids.append(v)

if len(pages) == 0:
    print("Error: No page table data found. Check output.txt format.")
    exit()

# Convert -1 to '-' for display
frame_display = [str(f) if f != -1 else '-' for f in frames]

# Create table data
table_data = []
for i in range(len(pages)):
    table_data.append([pages[i], frame_display[i], valids[i]])

# Plot table
fig, ax = plt.subplots(figsize=(6, 10))
ax.axis('tight')
ax.axis('off')

table = ax.table(cellText=table_data,
                 colLabels=["Page", "Frame", "Valid"],
                 loc='center')

table.auto_set_font_size(False)
table.set_fontsize(10)
table.scale(1, 1.5)

plt.title("Page Table Visualization", fontsize=14)
plt.show()