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V1064. The left operand of integer divi…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
Additional information
Contents

V1064. The left operand of integer division is less than the right one. The result will always be zero.

Sept. 14, 2020

The analyzer has detected a suspicious expression that contains an integer division or modulo operation, with the left operand always being less than the right operand. Such an expression will always evaluate to zero.

Consider the following example:

if ( nTotal > 30 && pBadSource->m_nNegativeVotes / nTotal > 2/3 )
{
  ....
}

Since both literals '2' and '3' are of integer type, the quotient will also be integer and, therefore, zero. It means the expression above is equivalent to the following one:

if ( nTotal > 30 && pBadSource->m_nNegativeVotes / nTotal > 0 )
{
  ....
}

A correct way to fix this error is to explicitly cast one of the operands to a floating-point type, for example:

if ( nTotal > 30 && pBadSource->m_nNegativeVotes / nTotal >
                            static_cast<float>(2)/3 )
{
  ....
}

Or:

if ( nTotal > 30 && pBadSource->m_nNegativeVotes / nTotal > 2.0f/3 )
{
  ....
}

This diagnostic is classified as:

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