Do not use a semicolon on the same line as an if
, for
, or while
statement because it typically indicates programmer error and can result in unexpected behavior.
In this noncompliant code example, a semicolon is used on the same line as an if
statement:
if (a == b); { /* ... */ } |
It is likely, in this example, that the semicolon was accidentally inserted:
if (a == b) { /* ... */ } |
Errors of omission can result in unintended program flow.
Recommendation | Severity | Likelihood | Remediation Cost | Priority | Level |
---|---|---|---|---|---|
EXP15-C | High | Likely | Low | P27 | L1 |
Tool | Version | Checker | Description |
---|---|---|---|
Astrée | empty-body | Fully checked | |
Axivion Bauhaus Suite | CertC-EXP15 | Fully implemented | |
CodeSonar | LANG.STRUCT.EBS | Empty branch statement | |
Helix QAC | C3109 | ||
Klocwork | SEMICOL | ||
LDRA tool suite | 11 S, 12 S, 428 S | Fully Implemented | |
Parasoft C/C++test | CERT_C-EXP15-a | Suspicious use of semicolon | |
PC-lint Plus | 721, 722 | Partially supported: reports missing body from if, for, or while with semi-colon immediately following predicate | |
Polyspace Bug Finder | CERT C: Rec. EXP15-C | Checks for semicolon on same line as for, if or while statement (rule fully covered) | |
PVS-Studio | V529, V715 | ||
SonarQube C/C++ Plugin | S1116 | ||
RuleChecker | empty-body | Fully checked |
SEI CERT Oracle Coding Standard for Java | MSC51-J. Do not place a semicolon immediately following an if, for, or while condition |
ISO/IEC TR 24772:2013 | Likely Incorrect Expression [KOA] |
MITRE CWE | CWE-480, Use of incorrect operator |
[Hatton 1995] | Section 2.7.2, "Errors of Omission and Addition" |