auto save

3.py

+b=float(input('多重：'))
+a=float(input('多高：'))
+c=b/(a*a)
+if c>=28:
+    print('肥胖')
+elif c>24.0 and c<=27.9:
+    print('过重')
+elif c>18.5 and c<23.9:
+    print('正常')
+else: 
+    print('偏瘦')
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