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Assign NULL to pointer

#include <stdio.h> int main(void) {   int number = 0;                    int *pointer = NULL;               number = 10;   printf("\nnumber's address: %p", &number);            /* Output the address */   printf("\nnumber's value: %d\n\n", number);           /* Output the value   */   return 0; } number's address: 9a378 number's value: 10