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What is the size of the following structure in C++: struct Employee { int id; char name[20]; float salary; };
Answer & Solution
Answer: Option
D
Solution:
In C++, the size of a structure is determined by the sum of the sizes of its individual members, taking into account padding for alignment. The
The size of an integer is typically 4 bytes, the size of a float is also typically 4 bytes, and the size of each character in the array depends on the character set being used (usually 1 byte per character). However, due to memory alignment requirements, additional padding may be added after the
So, the calculation of the structure size would be:
Padding to align
Total: 4 bytes (id) + 20 bytes (name) + 4 bytes (padding) + 4 bytes (salary) = 32 bytes.
Therefore, the correct answer is Option D: 32 bytes.
Employee structure consists of three members: an integer id, an array of characters name of size 20, and a float salary.The size of an integer is typically 4 bytes, the size of a float is also typically 4 bytes, and the size of each character in the array depends on the character set being used (usually 1 byte per character). However, due to memory alignment requirements, additional padding may be added after the
name array to ensure proper alignment of subsequent members.So, the calculation of the structure size would be:
int id: 4 byteschar name[20]: 20 bytesPadding to align
salary to the next 4-byte boundary (assuming 4-byte alignment)float salary: 4 bytesTotal: 4 bytes (id) + 20 bytes (name) + 4 bytes (padding) + 4 bytes (salary) = 32 bytes.
Therefore, the correct answer is Option D: 32 bytes.