C Programming – Swap function using Pointers , pass by address

C Programming – Swap function using Pointers , pass by address

 

To learn basics of pointer & pointer arithmetic concepts, refer tutorial Array and Pointers Arithmetic in C Programming – Examples

Swap is function to exchange or interchange the values of two variables. This function interchange the value of two variable using temporary variable.

In this code,

Step-1: In main function, x and y are integer type variables are initialized to 100 and 200 respectively,

Step-2: display the values of x and y before swap function call.

Step-3: swap function is called, address of x and y are send as parameter.

Step-4: In swap function, these addresses are placed in pointer variable p and q, i.e pointer variable p holds the address of x variable and pointer variable q holds the address of y variable.

Step-5: In swap, t is temporary variable,

t= *p;  *p gives the value stored at variable x, which is 100 and assigns to variable t.

*p=*q; *q gives the value stored at variable y, which is 200 and assigns to *p , i.e as value for variable x becomes 200

*q=t;  assign the value of t to variable , which is 100 to *q , i,e as value of for y variable becomes 100

step-6: In main function, display the values of x and y again, which is interchanged.

OUTPUT

output-Swap-function-using-Pointers-working

Download Code : C Programming - Swap function using Pointers working (32 downloads)