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Dart katta harfga o'zgartirish

Dart kichik harfga o'zgartirish

void main() { 
   String uStr = "ABC"; 
   String lStr = "hello"; 
   print(uStr.toLowerCase()); 
   print(lStr.toLowerCase()); 
}

4

Dart katta harfga o'zgartirish

void main() { 
   String uStr = "ABC"; 
   String lStr = "hello"; 
   
   print(uStr.toUpperCase()); 
   print(lStr.toUpperCase()); 
}

4

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