Web Reference: Jul 23, 2025 · Sizeof operator is a compile time unary operator which can be used to compute the size of its operand. The result of sizeof is of unsigned integral type which is usually denoted by size_t. strlen () is a predefined function in C whose definition is contained in the header file "string.h". strlen() is used to get the length of a string stored in an array. sizeof() is used to get the actual size of any type of data in bytes. Besides, sizeof() is a compile-time expression giving you the size of a type or a variable's type. It doesn't care about the value of the variable. Sep 5, 2024 · That‘s where the standard library functions strlen () and sizeof () come in – yet their differences can cause confusion. In this comprehensive guide, we‘ll unpack everything from the technical internals to best practices for each function.
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