Computer Programming C Laboratory: Pointers C Programs

Write a C program to interchange the values stored in two variables using function with pointers

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using pointers - C Programming

Write a C program to interchange the values stored in two variables using function with pointers.

The below program shows the contents of two variables, which can be interchanged using their address locations.

The function interchange() receives the addresses of the two variables 'a' and 'b' and exchanges their contents.

/* Program to interchange the values stored in two variables using function with pointers */

#include <stdio.h>

main()

{

/* Local definitions */

void interchange(int *, int *); /* interchange is a function with integer pointer variable */

int a=39, b=77;

/* Statements */

printf("\nBefore Interchange: a = %d, b = %d\n",a,b);

interchange(&a,&b); /* function call */

printf("After Interchange : a = %d, b %d, b = %d\n",a,b);

} /* main */

void interchange (int *a, int *b)

{

/* Local definitions */

int t;

t=*a;

*a= *b;

*b=t;

} /* interchange */

OUTPUT

Before Interchange: a = 39, b = 77

After Interchange : a = 77, b = 39

EXPLANATION: In the above program the variable a is initialised as value 39 and b is initialised as value 77, then prints the values of a and b then call the user defined function interchange() using address location of a and b. In the user‒defined function variable a and b is declared as pointer variable. The body of function interchange the value a to b and b to a using third variable t then control transfer to the main program and prints the value of a and b after interchanged.

Computer Programming C Laboratory: Pointers C Programs : Tag: C Programming : - Write a C program to interchange the values stored in two variables using function with pointers

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Computer Programming C Laboratory: Pointers C Programs

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