fork(3) download
copy 
  1. #include <stdio.h>
  2. #include <stddef.h>
  3. #include <ctype.h>
  4.  
  5. #define MAX_STR_LEN 50
  6.  
  7. void to_camel_case(char *str)
  8. {
  9.     int idx = 0;
  10.     int newIdx = 0;
  11.     int wasUnderscore = 0;
  12.  
  13.     // just to be on the safe side
  14.     if (!str || strlen(str) >= MAX_STR_LEN)
  15.         return;
  16.  
  17.     while (str[idx])
  18.     {
  19.         if (str[idx] == '_')
  20.         {
  21.         	idx++;
  22.             // no copy in this case, just raise a flag that '_' was met
  23.             wasUnderscore = 1;
  24.         }
  25.         else if (wasUnderscore)
  26.         {
  27.             // next letter after the '_' should be uppercased
  28.             str[newIdx++] = toupper(str[idx++]);
  29.             // drop the flag which indicates that '_' was met
  30.             wasUnderscore = 0;
  31.         }
  32.         else
  33.         {
  34.             // copy the character and increment the indices
  35.             str[newIdx++] = str[idx++];
  36.         }
  37.     }
  38.  
  39.     str[newIdx] = '\0';
  40. }
  41.  
  42. int main(void) {
  43.  
  44. 	char words[][MAX_STR_LEN] = {"hello_world", "hello___world", "hel_lo_wo_rld__", "__hello_world__"};
  45.  
  46. 	for (int i = 0; i < sizeof(words)/sizeof(words[0]); ++i)
  47. 	{
  48. 		printf("String %s became ", words[i]);
  49. 		to_camel_case(words[i]);
  50. 		printf("%s\n", words[i]);
  51. 	}
  52.  
  53. 	return 0;
  54. }
  55.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
String hello_world became helloWorld
String hello___world became helloWorld
String hel_lo_wo_rld__ became helLoWoRld
String __hello_world__ became HelloWorld
https://ideone.com/CzBQru
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!