| description | Learn more about: Arithmetic overflow: '%operator%' operation causes overflow at compile time. Use a wider type to store the operands | ||
|---|---|---|---|
| title | Warning C26450 | ||
| ms.date | 01/08/2017 | ||
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Arithmetic overflow: 'operator' operation causes overflow at compile time. Use a wider type to store the operands (io.1)
This warning indicates that an arithmetic operation was provably lossy at compile time. It can be asserted when the operands are all compile-time constants. Currently, we check left shift, multiplication, addition, and subtraction operations for such overflows.
Warning C4307 is a similar check in the Microsoft C++ compiler.
Code analysis name: RESULT_OF_ARITHMETIC_OPERATION_PROVABLY_LOSSY
int multiply()
{
const int a = INT_MAX;
const int b = 2;
int c = a * b; // C26450 reported here
return c;
}To correct this warning, use the following code.
long long multiply()
{
const int a = INT_MAX;
const int b = 2;
long long c = (long long)a * b; // OK
return c;
}int add()
{
const int a = INT_MAX;
const int b = 2;
int c = a + b; // C26450 reported here
return c;
}To correct this warning, use the following code:
long long add()
{
const int a = INT_MAX;
const int b = 2;
long long c = (long long)a + b; // OK
return c;
}int subtract()
{
const int a = -INT_MAX;
const int b = 2;
int c = a - b; // C26450 reported here
return c;
}To correct this warning, use the following code.
long long subtract()
{
const int a = -INT_MAX;
const int b = 2;
long long c = (long long)a - b; // OK
return c;
}