Analyze the following C program (with real newlines) and select the best diagnosis:\n#include<stdio.h>\nint main()\n{\n int i = 10, j = 20;\n if(i = 5) && if(j = 10)\n printf("Have a nice day");\n return 0;\n}\n\nWhat is the correct compiler outcome?

Introduction / Context:
This question targets the grammar rules for if conditions and operator combining in C. It also probes whether assignment inside a condition is valid and how tokens like if may (or may not) appear within expressions.

Given Data / Assumptions:

• Two tokens “if” are written in an expression: if(i = 5) && if(j = 10).
• No extra parentheses group the statements as separate conditionals.
• Standard C syntax rules apply.

Concept / Approach:
In C, the grammar requires an expression inside if ( ... ). The token if cannot appear as an operand within another expression. The sequence if(i = 5) && if(j = 10) attempts to chain two if statements using &&, which is syntactically invalid. While assignments inside a single if are allowed (e.g., if ((i = 5) && (j = 10))), embedding the keyword if in the middle of an expression is illegal.

Step-by-Step Solution:
Parse: after the first ), the next token is &&, then “if” again.Since “if” cannot follow && as an expression operand, parsing fails.Compiler emits a syntax error; program does not compile.

Verification / Alternative check:
Rewrite correctly: if ((i = 5) && (j = 10)) printf(...); compiles and prints.

Why Other Options Are Wrong:
The program cannot produce output or run silently because it fails to compile. “Undeclared identifier if” is not the standard diagnostic; the core issue is syntax, not naming. “Warning only” understates the fatal error.

Common Pitfalls:
Confusing the legal expression (i = 5) with the illegal keyword if embedded in expressions; forgetting parentheses when combining assignments with logical operators.

Final Answer:
Error: Expression syntax