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Hello interview question #63

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db20fe9
Evaluate query String
Apr 15, 2025
ada98ce
Hello Interview Question
benmak11 May 1, 2025
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2 changes: 1 addition & 1 deletion .idea/gradle.xml
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2 changes: 1 addition & 1 deletion .idea/misc.xml
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59 changes: 31 additions & 28 deletions .idea/workspace.xml
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71 changes: 71 additions & 0 deletions src/main/java/practiceinterviews/hellointerview/EvaluateQuery.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,71 @@
package practiceinterviews.hellointerview;

public class EvaluateQuery {

public boolean evaluateQueryString(String query, int x) {
String exp = query.replace("X", String.valueOf(x));

exp = exp.trim();
if (exp.startsWith("(") && exp.endsWith(")"))
exp = exp.substring(1, exp.length() - 1);

return evaluate(exp);
}

private boolean evaluate(String exp) {
exp = exp.trim();

if (exp.startsWith("(")) {
int openCnt = 0;
for (int i = 0; i < exp.length(); i++) {
if (exp.charAt(i) == '(') openCnt++;
if (exp.charAt(i) == ')') openCnt--;
if (openCnt == 0) {
String inner = exp.substring(1, i);
boolean innerResult = evaluate(inner);
String remaining = exp.substring(i + 1).trim();
if (remaining.isEmpty())
return innerResult;
return evaluate(innerResult + " " + remaining);
}
}
}

if (exp.contains("&&")) {
String[] parts = exp.split("&&", 2);
return evaluate(parts[0]) && evaluate(parts[1]);
}
if (exp.contains("||")) {
String[] parts = exp.split("\\|\\|", 2);
return evaluate(parts[0]) && evaluate(parts[1]);
}

if (exp.contains("<=")) {
String[] parts = exp.split("<=", 2);
return Integer.parseInt(parts[0].trim()) <= Integer.parseInt(parts[1].trim());
}
if (exp.contains(">=")) {
String[] parts = exp.split(">=", 2);
return Integer.parseInt(parts[0].trim()) >= Integer.parseInt(parts[1].trim());
}
if (exp.contains("<")) {
String[] parts = exp.split("<", 2);
return Integer.parseInt(parts[0].trim()) < Integer.parseInt(parts[1].trim());
}
if (exp.contains(">")) {
String[] parts = exp.split(">", 2);
return Integer.parseInt(parts[0].trim()) > Integer.parseInt(parts[1].trim());
}
if (exp.contains("==")) {
String[] parts = exp.split("==", 2);
return Integer.parseInt(parts[0].trim()) == Integer.parseInt(parts[1].trim());
}
if (exp.contains("!=")) {
String[] parts = exp.split("!=", 2);
return Integer.parseInt(parts[0].trim()) != Integer.parseInt(parts[1].trim());
}

// If it's a single value, parse it as a boolean
return Boolean.parseBoolean(exp);
}
}
34 changes: 34 additions & 0 deletions src/test/java/practiceinterviews/hellointerview/EvaluateQueryTest.java
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package practiceinterviews.hellointerview;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

class EvaluateQueryTest {

EvaluateQuery eval;
String queryOne;
int queryOneX;
String queryTwo;
int queryTwoX;

@BeforeEach
void setUp() {
eval = new EvaluateQuery();
queryOne = "(((X < 3) or (X > 1)) and (X < 10)))";
queryOneX = 2;
queryTwo = "";
queryTwoX = 4;
}

@Test
void test_evaluateQueryOne() {
boolean result = eval.evaluateQueryString(queryOne, queryOneX);
assertTrue(result);
}

@Test
void test_evaluateQueryTwo() {
}
}
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