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It gives users a better way to identify and point out certain parts of the slide. The feature also highlights special aspects Êor characteristics found among the selection.
Cassandra Dibbert
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Which scientist built the first primitive microscope?
Robert Hooke in the year 1665 while he was observing cork cells (bark of the tree).
What is different between object and variable in c plus plus?
A variable is simply a named value where the value is not constant -- meaning it can be changed at any time. A pointer is a variable (or a constant) that can store a memory address and provides indirect access to that memory address. It is called a pointer because it is said to "point to" the memory address it contains. A pointer that doesn't actually point at anything should store the value zero (represented by the constant NULL). When you allocate memory dynamically, you must maintain at least one pointer to that memory in order to release the memory back to the system, which is achieved by deleting the pointer, and then nullifying the pointer, or pointing it to another allocation. Pointers can also be typed, such that the memory address being pointed is treated as if it were that type, thus a pointer to a char can be used to determine the value of each individual byte in a multi-byte value, such as an int, simply by incrementing its stored address to traverse the individual bytes. By the same token an array of 4 bytes can be treated as if it were a single 32-bit value, simply by pointing at the first byte using a pointer with type int. Note that a pointer can only physically point at one byte at a time, but its type allows you to access one or more contiguous bytes according to its type, thus incrementing the pointer's stored address will advance the pointer by the size of its type. Thus a pointer to int will automatically increment (or decrement) by sizeof(int) bytes. Pointers can also point at other pointers, adding extra levels of indirection. This is most useful when you need to pass a pointer to a function by reference, since all pointers are always passed by value. However, passing a pointer to a pointer is the same as passing the pointer being pointed at by reference, which allows the pointer itself to be manipulated, not just what it points at. Pointer to pointer types are also useful when allocating large dynamic arrays as they allow the array to be allocated non-contiguously as a series of smaller, separate arrays. This uses more memory overall, but allocating many smaller arrays is far more likely to succeed where a large contiguous allocation could easily fail if a large enough block of free memory is not available.
What is the use of pointer in c?
A double pointer in C or C++ ... int ** ppi; ... simply means that ppi is a pointer that points to a pointer that points to an int. When defining function-parameters, another way of declaring this is ... int * ppi[]; ... which means that ppi is a pointer to an array of pointers that each point to an int, which happens to have the exact same meaning, but it is more telling in terms of what the usefulness of such a double pointer might have. Think of main() ... int main (int agrc, char ** argv); int main (int argc, char * argv[]); ... the two forms have exactly the same meaning, but the second form more clearly says what the design paradigm is, that argv is a pointer to an array of pointers that each point to an array of char, i.e. the arguments of the program's invocation.
What is a canal and why is it useful?
A canal is a system using man dug trenches filled with water to be used to move boats from water body to water body or up to a city where a port may be built. thus allowing a greater volume of goods to be moved.
Why is the latest versions of css are important?
Because it adds more features that you can use, that maybe before you had to do a hack to do like to round the edges of a div you had to do the webkit and mozilla hack which was -webkit-border-radius and -moz-border-radius and now it is a built in feature with border radius
When was the microscope built?
Yes
Who built the microscope?
Van Leeuwenhoek
What happens if text is selected and then the backspace key is pressed?
Pressing the backspace key with text selected automatically auto-corrects your spelling. It's a very useful feature built into most modern computers built after 2005.
Robert Hooke built the first?
microscope
Who built first microscope?
Van Leeuwenhoek
What kind of microscope did Robert Hooke use?
Robert Hooke built the compound microscope. this microscope was made out of more that one lens
Around what feature was a Greek polis usually built?
Q: Around what feature was a Greek polis built?A: A Greek polis was usually built around a strong fortress.
Who built the simple microscope in 1674?
Anton van Leeuwenhoek
Near which type of physical feature were most of the earliest farming villages built?
Near which type of physical feature were most of the earliest farming villages built?
Was Niagara Falls built by humans?
Niagara Falls is a natural feature; it was not built by humans.
Who built the niagara falls?
No one built the Niagara Falls. It is a natural feature in the Earth. :)
What did antoni van Leeuwenhoek do?
He discovered bacteria with his self designed microscope.
