C - Array and Pointers Examples Learning C
C Function References
C Useful Resources
Selected Reading

Copyright © 2014 by tutorialspoint

 Home References About TP Advertising # C - Array and Pointers Examples ## Printing pointers:

A program that prints out pointers and the values they point to:

 ```#include int main() { int a = 10, b = 2; int *p1, *p2; p1 = &a; p2 = &b; printf("%p %p \n", p1, p2); printf("%d %d \n", *p1, *p2); return 0; } ```

This will produce following result:

 ```0xbfffdac4 0xbfffdac0 10 2 ```

## Passing pointers as parameters:

A program that swaps integers using a function that accepts pointers to the integers to be swapped:

 ```#include void swap(int * q,int * p) { int temp = *p; *p = *q; *q = temp; } int main() { int a = 10, b = 2, x = 3, y = 5; printf("a,b,x,y: %d,%d,%d,%d\n", a, b, x, y); swap(&x, &y); swap(&a, &b); printf("a,b,x,y: %d,%d,%d,%d\n", a, b, x, y); } ```

It will produces following result:

 ```a,b,x,y: 10,2,3,5 a,b,x,y: 2,10,5,3 ```

## Passing pointers as parameters:

A program that computes the area and perimeter of a rectangle:

 ```#include void rectangle(int a, int b, int * area, int * perim); int main() { int x, y; int area, perim; printf("Enter two values separated by space: " ); scanf("%d %d", &x, &y); rectangle(x, y, &area, &perim); printf("Area is %d Perimeter is %d\n", area, perim); return 0; } void rectangle(int a,int b,int * area,int * perim) { *area = a * b; *perim = 2 * (a + b); } ```

This will produce following result:

 ```Enter two values separated by space: 10 15 Area is 150 Perimeter is 50 ```

## Passing arrays as parameters:

A program that reads elements and assign them in an array. Then, it prints the array elements out.

 ```#include void get_array(int a[], int size); void prt_array(int a[], int size); #define SIZE 10 int main() { int a[SIZE]; get_array(a, SIZE); prt_array(a, SIZE); printf("\n"); return 0; } void get_array(int a[], int size) { int i; printf("Enter 10 values, after each value press enter:\n " ); for (i = 0; i < size; i++) scanf("%d", &a[i]); } void prt_array(int a[], int size) { int i; printf("Printing all values :\n"); for (i = 0; i < size; i++) printf("%d\n", a[i]); } ```

This will produce something like:

 ```Enter 10 values, after each value press enter: 10 2 3 4 5 6 7 8 9 10 Printing all values : 10 2 3 4 5 6 7 8 9 10 ```  Advertisements

 Advertisements
Advertisements