Which phase of compiler will generate error if semicolon ismissing in a c program?

In a compiler's operation, the phase responsible for generating errors such as a missing semicolon in a C program is primarily the Parsing Phase.

Explanation:

1. Lexical Analysis: In this initial phase, the source code is scanned for lexemes, which are the fundamental components (like keywords, operators, literals, etc.). The lexer does not concern itself with syntax errors like a missing semicolon; it just tokenizes the code.

2. Parsing: After lexical analysis, the parser checks the structure of the code using the syntax rules of the programming language. If a semicolon is missing, the parser will detect that the expected symbol or token is not present, hence leading to a syntax error.

3. Semantic Analysis: Although this phase also checks for certain types of errors, it primarily validates meanings and types of constructs, rather than syntax errors like a missing semicolon.

Conclusion:

Thus, the Parsing Phase is where a compiler would generate an error if a semicolon is missing in a C program, because this phase rigorously checks the syntax according to the grammar of the language.