Answer to Question #274626 in C++ for khan

Question

What is a data type? Differentiate between array and pointer. Write a program to interchange 2 variables without using the third one.

Answer 1

What is a data type? - A data type is a classification of data that tells the compiler or interpreter how the programmer intends to use the data.

Differentiate between array and pointer. An array is a memory area in which data of the same type are arranged sequentially, but the pointer is a cell of memory, where is an address to the cell of memory.

Write a program to interchange 2 variables without using the third one.

Write a program to interchange 2 variables without using the third one.

This problem can be solved in a single line

int main(void)
{
  int a = 1, b = 2;
  // swap
  a = a + b - (b = a);
  // result: a = 1 + 2 - 1 = 2, b = 1
}