cpp / beginner
Snippet
The sizeof Operator for Memory Inspection
The sizeof operator returns the size in bytes of a type or variable at compile time. It is useful for understanding how much memory different data types consume. This is especially important in C++ because the size of fundamental types can vary between platforms. sizeof always evaluates to a constant at compile time, meaning it adds no runtime overhead.
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#include <iostream>#include <climits>int main() {std::cout << "int size: " << sizeof(int) << " bytes" << std::endl;std::cout << "double size: " << sizeof(double) << " bytes" << std::endl;std::cout << "char size: " << sizeof(char) << " bytes" << std::endl;std::cout << "long long size: " << sizeof(long long) << " bytes" << std::endl;std::cout << "Minimum char value: " << CHAR_MIN << std::endl;std::cout << "Maximum char value: " << CHAR_MAX << std::endl;return 0;}
Breakdown
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sizeof(int)
Returns byte size of int type (typically 4 bytes)
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sizeof(double)
Returns byte size of double type (typically 8 bytes)
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sizeof(char)
Returns byte size of char type (always 1 byte)
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CHAR_MIN and CHAR_MAX
Constants from <climits> showing char range