# How do you determine the size of a structure?

June 19, 2019 Off By idswater

## How do you determine the size of a structure?

In C language, sizeof() operator is used to calculate the size of structure, variables, pointers or data types, data types could be pre-defined or user-defined. Using the sizeof() operator we can calculate the size of the structure straightforward to pass it as a parameter.

## What is the size of a structure variable?

For ‘int’ and ‘double’, it takes up 4 and 8 bytes respectively. The compiler used the 3 wasted bytes (marked in red) to pad the structure so that all the other members are byte aligned. Now, the size of the structure is 4 + 1 +3 = 8 bytes. The size of the entire structure is 8 bytes.

## Does memset use a loop?

memset(d, 0, sizeof(double)*length); memset can be faster since it is written in assembler, whereas std::fill is a template function which simply does a loop internally.

## How is size _ t converted to an int in Memset?

The value is passed as an int, but the function fills the block of memory using the unsigned char conversion of this value. Number of bytes to be set to the value. size_t is an unsigned integral type.

## What is the function Memset in C library?

C library function – memset() Description. The C library function void *memset(void *str, int c, size_t n) copies the character c (an unsigned char) to the first n characters of the string pointed to, by the argument str.

## How does Memset fill a block of memory?

Pointer to the block of memory to fill. Value to be set. The value is passed as an int, but the function fills the block of memory using the unsigned char conversion of this value. Number of bytes to be set to the value. size_t is an unsigned integral type.

## What is the prototype of Memset in Java?

memset() prototype. void* memset( void* dest, int ch, size_t count ); The memset() function takes three arguments: dest, ch and count. The character represented by ch is first converted to unsigned char and then copies it into the first count characters of the object pointed to by dest.