uni/inf1060/hw1/oppg2/oppgaver.c

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

// b
int stringsum(char* str)
{
	int sum = 0;
	char c;
	int i;
	for (i = 0; (c = str[i]); ++i)
	{
		if (c >= 'A' && c <= 'Z')
			sum += c - 'A' + 1;
		else if (c >= 'a' && c <= 'z')
			sum += c - 'a' + 1;
		else
			return -1;
	}

	return sum;
}

// c
int distance_between(char* str, char ch)
{
	int first = -1;

	char c;
	int i;
	for (i = 0; (c = str[i]); ++i)
	{
		if (c != ch)
			continue;

		if (first == -1)
			first = i;
		else
			return i - first;
	}

	return -1;
}

// d
char* string_between(char* str, char ch)
{
	int start = -1;

	char c;
	int i;
	for (i = 0; (c = str[i]); ++i)
	{
		if (c != ch)
			continue;

		if (start == -1)
		{
			start = i;
		}
		else
		{
			char* res = malloc(i - start + 1);
			memcpy(res, str + start + 1, i - start - 1);
			res[i - start - 1] = '\0';
			return res;
		}
	}

	return NULL;
}

// e
char** split(char* str)
{
	char delim = ' ';

	int len = 0;
	int start = 0;
	char** res = NULL;

	char c;
	int i;
	for (i = 0; (c = str[i]); ++i)
	{
		if (c != delim)
			continue;

		len += 1;
		res = realloc(res, sizeof(*res) * len);

		char* s = malloc(i - start + 1);
		memcpy(s, str + start, i - start);
		s[i - start] = '\0';
		res[len - 1] = s;
		start = i + 1;
	}

	// Add the last item, and null

	len += 2;
	res = realloc(res, sizeof(*res) * len);

	char* s = malloc(i - start + 1);
	memcpy(s, str + start, i - start);
	s[i - start] = '\0';
	res[len - 2] = s;

	res[len - 1] = NULL;

	return res;
}

// g
void stringsum2(char* str, int* res)
{
	int sum = 0;
	char c;
	int i;
	for (i = 0; (c = str[i]); ++i)
	{
		if (c >= 'A' && c <= 'Z')
			sum += c - 'A' + 1;
		else if (c >= 'a' && c <= 'z')
			sum += c - 'a' + 1;
		else
		{
			*res = -1;
			return;
		}
	}

	*res = sum;
}