Web Reference: Jul 26, 2024 · Arrays in C++ must have their size denoted by a compile-time constant, not a runtime variable. This should be std::vector arr(len); return(arr); maybe you wanted to return 0; instead. The return value from main is a success / failure code you send back to the OS. Jun 19, 2025 · If it can't find an acceptable conversion, the compiler issues an error and doesn't compile the program. For more information about the rules that govern the standard conversions, see Standard Conversions. Feb 16, 2024 · Although n2 is constexpr, its value -5 cannot be represented exactly in the destination type, so this is considered to be a narrowing conversion, and because we are doing list initialization, the compiler will error and halt the compilation.
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