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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int array[4] = {10, 20, 30, 40};		// Initial values in array
  5. 	int* ptr = &array[0];					// Point to the first element's memory address
  6. 											// It is same as: int* ptr = array;
  7.  
  8. 	// Print out values of first two elements
  9. 	printf("First element value: %d\n", array[0]);
  10. 	printf("Second element value: %d\n", array[1]);
  11.  
  12. 	// Update values using pointer
  13. 	printf("Updating values of first two elements using pointer.\n");
  14. 	*ptr = 11;		// Update value of first element
  15. 	++ptr;			// Move pointer to second element. To go back, you can use --ptr etc.
  16. 	*ptr = 21;		// Update value of second element
  17.  
  18. 	// Print out updated values of first two elements
  19. 	printf("First element value: %d\n", array[0]);
  20. 	printf("Second element value: %d\n", array[1]);
  21.  
  22. 	// In this example, we didn't touch third and fourth values of array,
  23. 	// which are "30" and "40".
  24.  
  25. 	return 0;
  26. }
  27.  
Success #stdin #stdout 0s 2052KB
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Standard input is empty
stdout
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First element value: 10
Second element value: 20
Updating values of first two elements using pointer.
First element value: 11
Second element value: 21
https://ideone.com/rScXEr
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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