Question

How to initialize a pointer in a separate function with C

Answer 1

#include <stdio.h>
#include <stdlib.h>

void initializePointer(int **pp, int size) {
    *pp = (int *)malloc(sizeof(int) * size); 
    if (*pp != NULL) {
        **pp = 98; 
    }
}

int main() {
    int *p = NULL; 

    initializePointer(&p, 5); // Pass the address of the pointer to the function

    if (p != NULL) {
        p[1] = 100;
        printf("%d %d\n", *p, p[0]);
        printf("%d %d\n", *(p + 1), p[1]);
        free(p); 
    } else {
        printf("Memory allocation failed.\n");
    }

    return 0;
}
 
   
   
/*
run:
   
98 98
100 100
   
*/

 

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