double pointer malloc in c
char *x; // Memory locations pointed to by x contain 'char' char **y; // Memory locations pointed to by y contain 'char*' x = (char*)malloc(sizeof(char) * 100); // 100 'char' y = (char**)malloc(sizeof(char*) * 100); // 100 'char*' // below is incorrect: y = (char**)malloc(sizeof(char) * 50 * 50); // 2500 'char' not 50 'char*' pointing to 50 'char'
double pointers C++
#include <stdio.h> int main(void) { int value = 100; int *value_ptr = &value; int **value_double_ptr = &value_ptr; printf("Value: %d\n", value); printf("Pointer to value: %d\n", *value_ptr); printf("Double pointer to value: %d\n", **value_double_ptr); }
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