• Source 
    1. #include <stdio.h>
    2.  
    3. void expand(char s1[], char s2[]);
    4. int getline(char s[], int lim);
    5.  
    6. int main(void) {
    7.  
    8. 	char s1[1000];
    9. 	char s2[1000];
    10.  
    11. 	getline(s1, 1000);
    12.  
    13. 	expand(s1, s2);
    14.  
    15. 	printf("%s", s2);
    16.  
    17. 	return 0;
    18. }
    19.  
    20. void expand(char s1[], char s2[])
    21. {
    22. 	int j = 1; //index for s2
    23. 	int c; // for saving starting point
    24.  
    25. 	s2[0] = s1[0]; //for preventing errors from 'i-1'
    26.  
    27. 	for(int i=1; i <= strlen(s1); i++)
    28. 	{
    29. 		if(s1[i] == '-')
    30. 		{
    31. 			if((isalpha(s1[i-1]) && isalpha(s1[i+1])) || (isdigit(s1[i-1]) && isdigit(s1[i+1]))) 
    32. 			{
    33. 				c = s1[i-1] + 1;
    34. 				while(c < s1[i+1])
    35. 				{
    36. 					s2[j++] = c++;
    37. 				}
    38. 			}
    39.  
    40. 		}
    41. 		else
    42. 		{
    43. 			s2[j++] = s1[i];
    44. 		}
    45. 	}
    46. }
    47. int getline(char s[], int lim) //getline and return length except '\0'
    48. {
    49. 	int c, i;
    50. 	for(i=0; i <= lim -1 && (c=getchar()) != EOF && c!= '\n'; i++)
    51. 	{
    52. 		s[i] = c;
    53. 	}
    54. 	if(c=='\n')
    55. 	{
    56. 		s[i] = c;
    57. 		i++;
    58. 	}
    59. 	s[i] = '\0';
    60. 	return i;
    61. }