split a string by a character without strtok in c - c

Question

I need to write code that reads a string of characters such as jasf#fjaf#afsj to a single dimension string and then ask for a separation character (eg: #) so it will get an output in two dimensions and for every line, it will be the words between the separation character like:
jasf
fjaf
afsj
I tried:
#include <stdio.h>
#include <string.h>
void main {
int s, k, b;
printf("please enter a long string\n");
gets(longstring);
s = strlen(longstring);
printf("please choose seperationg charcter\n");
scanf("%c", &ch);
if ((ch < 'A') || ((ch > 'Z') && (ch < 'a')) || (ch > 'z')) {
for (k = 0; k < s; k++) {
for (b = 0; longstring[k] == ch; ++b) {
strcpy(mat[b], longstring);
}
}
puts(mat[b]);
}

Answer 1

Your code is incomplete: the function definition for main lacks its argument list, which is not optional in C, longstring is not defined, etc.
Futhermore, your method is too complicated: you do not need to test for letters if the goal is just to output one line for each part of the string between separators.
Here is a simple solution:
#include <stdio.h>
#include <string.h>
int main() {
char longstring[256];
int i, len;
char sep;
printf("please enter a long string\n");
if (fgets(longstring, sizeof longstring, stdin)) {
len = strlen(longstring);
printf("please choose a separationg character: ");
if (scanf("%c", &sep) != 1)
return 1;
for (i = 0; i < len; i++) {
if (longstring[i] == sep)
putchar('\n');
else
putchar(longstring[i]);
}
}
return 0;
}

Answer 2

since your code is not complete , let me add what is missing to achieve the task :
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
char** str_split(char* a_str, const char a_delim)
{
char** result = 0;
size_t count = 0;
char* tmp = a_str;
char* last_comma = 0;
char delim[2];
delim[0] = a_delim;
delim[1] = 0;
/* Count how many elements will be extracted. */
while (*tmp)
{
if (a_delim == *tmp)
{
count++;
last_comma = tmp;
}
tmp++;
}
/* Add space for trailing token. */
count += last_comma < (a_str + strlen(a_str) - 1);
/* Add space for terminating null string so caller
knows where the list of returned strings ends. */
count++;
result = (char**) malloc(sizeof(char*) * count);
if (result)
{
size_t idx = 0;
char* token = strtok(a_str, delim);
while (token)
{
assert(idx < count);
*(result + idx++) = strdup(token);
token = strtok(0, delim);
}
assert(idx == count - 1);
*(result + idx) = 0;
}
return result;
}
int main()
{
char longstring[1024];
char** tokens;
char ch;
unsigned long s;
printf("please enter a long string\n");
gets(longstring);
s = strlen(longstring);
printf("please choose seperationg charcter\n");
scanf("%c", &ch);
if ((ch<'A') || ((ch>'Z') && (ch<'a')) || (ch>'z'))
{
tokens = str_split(longstring, ch);
if (tokens)
{
int i;
for (i = 0; *(tokens + i); i++)
{
printf("%s\n", *(tokens + i));
free(*(tokens + i));
}
printf("\n");
free(tokens);
}
}
return 0;
}