main.c

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

int isNumber(char c);
int isAlpha(char c);
int append(char tempS[], char variables[][100], int line);
int clean(char *tempS, int size);
void display(const char variables[][100], int line);
int equals(char tmp[100], char line[100]);

int main()
{

  char variables[100][100] = {"\0"};

  int i = 0, tmp = 0;
  char msg[100];
  char tempS[100] = "";
  int tempN;
  int currLine = 0;

  gets(msg);

  goto E0;

E0:
  if (isAlpha(msg[i]) == 1)
  {
    tempS[tmp] = msg[i];
    i++;
    tmp++;
    goto E1;
  }
  else if (isNumber(msg[i]) == 1)
  {
    tempN = msg[i] - '0';
    i++;
    goto E2;
  }
  else if (msg[i] == '\0')
  {
    display(variables, currLine);
    exit(0);
  }
  else if (msg[i] == ' ')
  {
    i++;
    goto E0;
  }
E1:
  if (msg[i] == '\0')
  {
    currLine = append(tempS, variables, currLine);
    tmp = clean(tempS, tmp);
    goto E0;
  }
  else if (msg[i] == ' ')
  {
    currLine = append(tempS, variables, currLine);
    tmp = clean(tempS, tmp);
    i++;
    goto E0;
  }
  else
  {
    tempS[tmp] = msg[i];
    i++;
    tmp++;
    goto E1;
  }
E2:
  if (msg[i] == '\0')
  {
    printf("N(%d)\n", tempN);
    goto E0;
  }
  else if (isAlpha(msg[i]) == 1)
  {
      printf("N(%d)\n", tempN);
    goto E0;
  }
  else if (msg[i] == ' ')
  {
    printf("N(%d)\n", tempN);
    i++;
    goto E0;
  }
  else if (isNumber(msg[i]) == 1)
  {
    tempN = tempN * 10 + (msg[i] - '0');
    i++;
    goto E2;
  }
}

int isNumber(char c)
{
  if (c >= '0' && c <= '9')
  {
    return 1;
  }
  return 0;
}

int isAlpha(char c)
{
  if (c >= 'A' && c <= 'Z')
  {
    return 1;
  }

  if (c >= 'a' && c <= 'z')
  {
      return 1;
  }
  return 0;
}

int equals(char tmp[100], char line[100])
{
  int result = 1;

  for (int k = 0; tmp[k] != '\0' || line[k] != '\0'; k++)
  {
    if (tmp[k] != line[k])
    {
      result = 0;
      return result;
    }
  }

  return result;
}

int append(char tempS[], char variables[][100], int line)
{
  int found = 0;
  for (int p = 0; p <= line; p++)
  {
    if (equals(tempS, variables[p]) == 1)
    {
      found = 1;
      printf("Found at V(%d)\n", p);
    }
  }

  if (found == 0)
  {
    for (int c = 0; variables[line][c] = tempS[c]; c++)
      ;
    printf("Created at V(%d)\n", line);
    line++;
  }

  return line;
}

int clean(char *tempS, int size)
{
  for (int i = 0; i <= size; i++)
    *(tempS + i) = 0;

  return 0;
}

void display(const char variables[][100], int line)
{
  printf("\nList of variables\n");
  for (int i = 0; i < line; i++)
  {
    printf("%d.....%s", i, variables[i]);
    printf("\n");
  }
}