LANG.STRUCT.UA : Useless Assignment

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CodeSonar^® 9.2p0

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LANG.STRUCT.UA : Useless Assignment

Summary

Some assignment always assigns the value that the variable being modified already has.

Properties

MisraC2025

MisraC2025:2.2

A project shall not contain dead code

MisraC2023

MisraC2023:2.2

A project shall not contain dead code

Misra2012

Misra2012:2.2

A project shall not contain dead code

Misra2004

Misra2004:14.2

All non-null statements shall either (a) have at least one side-effect however executed, or (b) cause control flow to change

AUTOSARC++14

AUTOSARC++14:M0-1-9

There shall be no dead code.

MisraC++2008

MisraC++2008:0-1-9

There shall be no dead code.

Irrelevant Code

Detect and remove code that has no effect or is never executed

JSF++

JSF++:187

All non-null statements shall potentially have a side-effect.

Example

#include <stdlib.h>
int useless_assignment(void){
    int i = rand();
    int j = i + 1;
    i = j - 1;        /* 'Useless Assignment' warning issued here */
    return i;
}

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.