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  1. #include<stdio.h>
  2. #include<stdbool.h>
  3. #include<string.h>
  4. char toLower(char ch);
  5.  
  6. int main()
  7. {
  8.     char I[100];
  9.     char ch;
  10.     int i;
  11.     printf("Enter string: ");
  12.     gets(I);
  13.     for( int i=0; i<strlen(I); i++)
  14.     {
  15.         I[i]=toLower(I[i]);
  16.     }
  17.     printf("%s\n", I);
  18.     return 0;
  19. }
  20.  
  21. char toLower(char ch)
  22. {
  23.     if(ch>='A' && ch<='Z')
  24.     {
  25.         ch= ch-'A'+'a';
  26.     }
  27.     return ch;
  28. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
ABcdefGHIJ
stdout 
Enter string: abcdefghij
https://ideone.com/1fBJ0h
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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