Definition of Relational Database & RDBMS 2.2 Entity, Table, Record, Field 2.3 Primary Key, Composite Key, Foreign Key 2.4 Referential Integrity 2.5 Types of Relationships 2.5.1 One-to-One 2.5.2 One-to-Many 2.5.3 Many-to-M

1. BOTTOM UP PARSING
WEEK: 10
LECTURE: 2
Program: BS CS/SE 6th Semester
Course: CS345 COMPILER CONCEPTS

2. Bottom-up Parsing
• Starts with the input symbols and construct parse tree up to the start symbol

3. Example
Input : a + b * c
S → E
E → E + T
E → E * T
E → T
T → id
a+b*c
T+b*c
E+b*c
E+T*c
E*c
E*T
E
S

4. Example 2
Input : aababbb
S → aSS
S → b
aababbb
aababbS
aabaSSS
aab(aSS)S
aabSS
a(aSS)S
aSS
S

5. Example
Input : aaaaba
S → aS
S → bS
S → a
aaaaba
aaaabS
aaaaS
aa(aS)
aaS
aS
S

6. Example 4
A CGG given by the productions
is
S → a
S → aAS
A → bS
s = abaabaa
abaabaa
abaabaS
abaabSS
abaaAS
abaabaa
abaabaS
abaa(bS)S
aba(aAS)
abaS
abSS
aAS