What Are Pointers?

Problems

Problem 3.1: Are pointers and arrays exactly the same thing? Can they be used identically? [Solution]

Problem 3.2: What does the following program do?

int main()
{
	char *p;
	for(p = "WNT"; *p; p++) printf("%c", *p - 1);
	printf("\n");
	return 0;
}

[Solution]

Problem 3.3: What does the following program do?

int main()
{
	char *p;
	for(p = "HAL"; *p; p++) printf("%c", *p + 1);
	printf("\n");
	return 0;
}

[Solution]

Problem 3.4: Will the following program compile? Will it run?

int main()
{
	char *p;
	p = p + 500;
	return 0;
}

[Solution]

Problem 3.5: Does the following code compile? What does it do?

int main()
{
	char word[] = ;
	char *spark[10];
	int i;
	for(i=0; i<10; i) spark[i] = word + (i % 5);
	for(i=0; i<10; i) printf("%c", *spark[i]);
	printf("\n");
	return 0;
}

[Solution]

Problem 3.6: Write the function: int strlen(char *str) or int strlen(char str[]) that takes a string and returns its length. Write it once using pointer notation and once using array notation. [Solution]

Problem 3.7: Give two names for the second element of the array: int spark[5]; [Solution]

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Pointers and Arrays