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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. int main(void) {
  5.  
  6. int ch;
  7. char input[100];
  8. int i = 0;
  9.  
  10. while((ch = getchar())!= EOF) {
  11.     if(isupper(ch)) {
  12.     	if (i != 0) {
  13.             input[i++] = '_';
  14.     	}
  15.         ch = tolower(ch);
  16.     }
  17.     input[i++] = ch;
  18. }
  19. input[i] = '\0'; // Null-terminate the string
  20. printf("%s\n", input);
  21.  
  22.  
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 9432KB
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stdin
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CamelCase
stdout
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camel_case
https://ideone.com/vjEwyv
language:
C99 (gcc 8.3)
created:
8 years ago
visibility:
public

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