Can we subtract 2 pointers in C++?

It turns out you can subtract two pointers of the same type. The result is the distance (in array elements) between the two elements.

What is the rule for subtracting two pointers?

When two pointers are subtracted, both must point to elements of the same array object or just one past the last element of the array object (C Standard, 6.5. 6 [ISO/IEC 9899:2011]); the result is the difference of the subscripts of the two array elements. Otherwise, the operation is undefined behavior.

Can we add or subtract two pointers?

3 Answers. Pointers contain addresses. Adding two addresses makes no sense, because you have no idea what you would point to. Subtracting two addresses lets you compute the offset between these two addresses, which may be very useful in some situations.

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Can we subtract two strings in C?

What you have subtracted there are not two strings, but two char * . c holds the memory address difference between a and b . This can be pretty much anything arbitrary. Here it just means that you have 16 bytes space between the start of the first string and the start of the second one on your stack.

Can we divide two pointers?

Not only multiplying, even addition and division are also not allowed in pointers. The only operation you can do is subtraction, if both the pointers are of same type.

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Can we compare two pointers in C?

How to compare pointers in C/C++? We can compare pointers if they are pointing to the same array. Relational pointers can be used to compare two pointers. Pointers can’t be multiplied or divided.

Can we multiply two pointers?

yes it is allowed, *x is not a pointer but a value pointed by x . and hence *x+*y; is addition of two values pointed by x and y . It multiplies or divides the pointed at values, and the pointed at values are not pointers, so multiplication and division is fine.

Can we subtract string in C++?

C++ Can’t subtract two strings – Stack Overflow.

Can we subtract two strings?

We traverse both strings from the end, one by one subtract digits. Reverse both strings. Keep subtracting digits one by one from 0’th index (in reversed strings) to the end of a smaller string, append the diff if it’s positive to end of the result.

Can you subtract pointers from each other why would you?

The subtraction of two pointers is possible only when they have the same data type. The result is generated by calculating the difference between the addresses of the two pointers and calculating how many bits of data it is according to the pointer data type.

Is multiplication of pointers allowed?

Multiplication and division of pointers are not allowed in C. Getting into your code, it works because you are not multiplying or dividing any pointers but multiplying and dividing the values pointed by those pointers as you have used the dereference operator.

How do you compare two strings using pointers?

String comparison by using pointers

#include
int stringcompare(char*,char*);
int main()
{
char str1[20]; // declaration of char array.
char str2[20]; // declaration of char array.
printf(“Enter the first string : “);
scanf(“%s”,str1);

What is subtraction of two pointers in C++?

The subtraction of two pointers gives the increments between the two pointers. Two integer pointers say ptr1 (address:1000) and ptr2 (address:1016) are subtracted. The difference between address is 16 bytes.

How to subtract a value from a pointer variable?

C pointer subtraction. It subtracts a value from the pointer variable. Subtracting any number from a pointer variable will give an address. The formula is as follows −. new_address= current_address – (number * size_of(data type)) Example. Following is the C program for C pointer subtraction −. Live Demo

What is arithmetic pointer addition and subtraction?

Two of the arithmetic pointer concepts are explained below, which are C pointer addition and subtraction respectively. C pointer addition refers to adding a value to the pointer variable. The formula is as follows −

How to find the distance between two pointers in an array?

The subtraction of two pointers in array will give the distance between the two elements. Let the address of first element i.e., is 1000 then address of second element a+1 will be 1004. Hence p1 = 1000 and p2 =1004. Thanks for contributing an answer to Stack Overflow!

Can we subtract 2 pointers in C++?