Add binary search implementation in C#124
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Reviewer's GuideAdds a standalone iterative binary search utility in C, complete with command-line prompts, input validation, dynamic memory management, and result reporting. Class diagram for binary search implementation in CclassDiagram
class binary_search {
+int binary_search(int arr[], int n, int target)
}
class main {
+int main(void)
}
main --> binary_search : calls
File-Level Changes
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WalkthroughA new C file implementing an iterative binary search algorithm is added. The implementation includes a Changes
Sequence DiagramsequenceDiagram
participant User
participant Program
participant Memory
User->>Program: Enter array size
Program->>Program: Validate size > 0
Program->>Memory: Allocate array
Memory-->>Program: Memory allocated
loop For each element
User->>Program: Enter sorted integer
Program->>Memory: Store in array
end
User->>Program: Enter target value
Program->>Program: binary_search(array, size, target)
Program->>Program: Compare mid element
alt Found
Program->>User: Return index
else Not found
Program->>User: Return -1
end
Program->>Memory: Free array
Memory-->>Program: Freed
Estimated code review effort🎯 2 (Simple) | ⏱️ ~8 minutes
Poem
Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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PR Compliance Guide 🔍Below is a summary of compliance checks for this PR:
Compliance status legend🟢 - Fully Compliant🟡 - Partial Compliant 🔴 - Not Compliant ⚪ - Requires Further Human Verification 🏷️ - Compliance label |
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Hey there - I've reviewed your changes and they look great!
Blocking issues:
- Avoid using 'scanf()'. This function, when used improperly, does not consider buffer boundaries and can lead to buffer overflows. Use 'fgets()' instead for reading input. (link)
- Avoid using 'scanf()'. This function, when used improperly, does not consider buffer boundaries and can lead to buffer overflows. Use 'fgets()' instead for reading input. (link)
- Avoid using 'scanf()'. This function, when used improperly, does not consider buffer boundaries and can lead to buffer overflows. Use 'fgets()' instead for reading input. (link)
Prompt for AI Agents
Please address the comments from this code review:
## Individual Comments
### Comment 1
<location> `C/binarySearch.c:25` </location>
<code_context>
+
+int main(void) {
+ int n;
+ if (printf("Enter number of elements: ") < 0) return 1;
+ if (scanf("%d", &n) != 1 || n <= 0) {
+ fprintf(stderr, "Invalid number of elements.\n");
</code_context>
<issue_to_address>
**suggestion:** Error handling for printf is rarely necessary.
Consider removing the printf return value check to streamline the code, as output errors are highly unlikely in this context.
```suggestion
printf("Enter number of elements: ");
```
</issue_to_address>
### Comment 2
<location> `C/binarySearch.c:26` </location>
<code_context>
if (scanf("%d", &n) != 1 || n <= 0) {
</code_context>
<issue_to_address>
**security (c.lang.security.insecure-use-scanf-fn):** Avoid using 'scanf()'. This function, when used improperly, does not consider buffer boundaries and can lead to buffer overflows. Use 'fgets()' instead for reading input.
*Source: opengrep*
</issue_to_address>
### Comment 3
<location> `C/binarySearch.c:39` </location>
<code_context>
if (scanf("%d", &arr[i]) != 1) {
</code_context>
<issue_to_address>
**security (c.lang.security.insecure-use-scanf-fn):** Avoid using 'scanf()'. This function, when used improperly, does not consider buffer boundaries and can lead to buffer overflows. Use 'fgets()' instead for reading input.
*Source: opengrep*
</issue_to_address>
### Comment 4
<location> `C/binarySearch.c:48` </location>
<code_context>
if (scanf("%d", &target) != 1) {
</code_context>
<issue_to_address>
**security (c.lang.security.insecure-use-scanf-fn):** Avoid using 'scanf()'. This function, when used improperly, does not consider buffer boundaries and can lead to buffer overflows. Use 'fgets()' instead for reading input.
*Source: opengrep*
</issue_to_address>Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
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| int main(void) { | ||
| int n; | ||
| if (printf("Enter number of elements: ") < 0) return 1; |
There was a problem hiding this comment.
suggestion: Error handling for printf is rarely necessary.
Consider removing the printf return value check to streamline the code, as output errors are highly unlikely in this context.
| if (printf("Enter number of elements: ") < 0) return 1; | |
| printf("Enter number of elements: "); |
PR Code Suggestions ✨Explore these optional code suggestions:
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Actionable comments posted: 0
🧹 Nitpick comments (2)
C/binarySearch.c (2)
31-35: Memory allocation properly checked.Good practice checking for allocation failure. The implementation handles errors correctly.
For pedantic safety, consider using
size_tfor array sizes and checking for potential overflow in the multiplication:- int n; + size_t n; if (printf("Enter number of elements: ") < 0) return 1; - if (scanf("%d", &n) != 1 || n <= 0) { + if (scanf("%zu", &n) != 1 || n == 0) { fprintf(stderr, "Invalid number of elements.\n"); return 1; } - int *arr = malloc(sizeof(int) * n); + if (n > SIZE_MAX / sizeof(int)) { + fprintf(stderr, "Array size too large.\n"); + return 1; + } + int *arr = malloc(sizeof(int) * n);
37-44: Excellent error handling and resource management.The array input loop correctly validates each
scanfcall and properly frees allocated memory on error paths, preventing memory leaks.Consider adding a brief comment reminding maintainers that the implementation assumes the user provides sorted input (as stated in the prompt):
printf("Enter %d sorted integers (ascending) separated by spaces or newlines:\n", n); + // Note: Binary search requires sorted input; no runtime validation performed for (int i = 0; i < n; ++i) {
📜 Review details
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Review profile: CHILL
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📒 Files selected for processing (1)
C/binarySearch.c(1 hunks)
🧰 Additional context used
🪛 Clang (14.0.6)
C/binarySearch.c
[error] 8-8: 'stdio.h' file not found
(clang-diagnostic-error)
⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)
- GitHub Check: Sourcery review
🔇 Additional comments (5)
C/binarySearch.c (5)
11-21: LGTM! Clean binary search implementation.The binary search algorithm is correctly implemented with proper overflow-safe midpoint calculation using
lo + (hi - lo) / 2. The logic is clear and handles all cases correctly.
23-29: Good input validation and error handling.The validation for the number of elements is thorough, checking both the scanf return value and ensuring
n > 0. Error messages are appropriately directed to stderr.
46-52: Consistent and thorough error handling.Target value input follows the same robust error handling pattern, ensuring allocated memory is freed on all error paths.
54-59: Clear and correct result handling.The search result is properly interpreted and user-friendly messages are displayed for both success and failure cases.
61-62: Proper resource cleanup.Memory is correctly freed before successful program exit, completing the robust resource management throughout the program.
2 participants
Add binary search implementation in C
Summary by Sourcery
New Features:
Summary by CodeRabbit
New Features