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  1.     #include<stdio.h>
  2.     #include<stdlib.h>
  3.     #define SIZE 30
  4.  
  5.     void allocate_memory(int*,int);
  6.  
  7.     int main(void){
  8.         int * pointer = NULL ;    //set pointer to null value
  9.         int array_size = SIZE;
  10. 	printf("\nMAIN:%p" ,(void*) pointer );	//value of pointer is null of course
  11.         allocate_memory(pointer,array_size);
  12. 	printf("\nMAIN:%p" ,(void*) pointer );	//	value of pointer is still null, even though allocate_memory was called ergo no memory was allocated.
  13.         free(pointer);	
  14. return 0 ;	
  15.     }
  16.  
  17.     void allocate_memory(int *pointer,int size)
  18.     {
  19.         pointer = malloc(size*sizeof(int));
  20. 	printf("\nFUNCTION: %p" ,(void*) pointer );	//value of pointer is null of course
  21.         if(pointer==NULL)
  22.         {
  23.             printf("Memory allocation fail!");
  24.             exit(1);
  25.         }
  26.         else
  27.             printf("\nMemory allocation successful");
  28.  
  29.  
  30.     }
Success #stdin #stdout 0s 1920KB
comments (?)
stdin 
Standard input is empty
stdout 
MAIN:(nil)
FUNCTION: 0x8de5008
Memory allocation successful
MAIN:(nil)
https://ideone.com/gvzURO
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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