In C++, we can create a pointer to a pointer that in turn may point to data or other pointer. Here, both x and y contain k stored at 1803 (1800+3). If we imagine that “geek” is stored at the memory locations that start at address 1800, we can represent the previous declaration as:Īs pointers and arrays behave in the same way in expressions, ptr can be used to access the characters of string literal. This declares an array with the literal representation for “geek”, and then a pointer to its first element is assigned to ptr. String literals are arrays of type character plus terminating null-character, with each of the elements being of type const char (as characters of string can’t be modified). String literals are arrays containing null-terminated character sequences. It means, the address stored in array name can’t be changed.įor example, if we have an array named val then val and &val can be used interchangeably. Pass-by-Reference with Reference Arguments does not require any clumsy syntax for referencing and dereferencing.Īn array name contains the address of first element of the array which acts like constant pointer. If wish to modify the original copy directly (especially in passing huge object or array) and/or avoid the overhead of cloning, we use pass-by-reference. The changes are made into a clone made by the called function. In C++, by default arguments are passed by value and the changes made in the called function will not reflect in the passed variable. Output: address of n1 in main(): 0x7ffcdb2b4a44Īddress of n1 in square1(): 0x7ffcdb2b4a2cĪddress of n2 in square2(): 0x7ffcdb2b4a48Īddress of n3 in square3(): 0x7ffcdb2b4a4c ![]() ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.
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