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Pasted as C++ by registered user xujiayu ( 5 years ago )
#include <stdio.h>
#include <conio.h>

int main()
{  /*NHAP VAO 1 KY TU LA CHU CAI , NEU NHAP SAI THI BAO ,THONG BAO DA NHAP SAI 
    NEU DUNG THI DI KIEM TRA DANG LA CHU CAI THUONG THI BIEN NO THANH HOA 
	NEU NO LA CHU HOA THI BIEN NO THANH CHU THUONG 
	*GOI Y : KY TU CHU CAI THUONG VA HOA CO MA ASCII CACH NHAU 32 DON VI 
	VIDU: a la 97 , A la 65 */

	char kytu;
	printf("\nhay nhap 1 ky tu chu cai : ");
	scanf("%c",&kytu);

    if((kytu >= 'a' && kytu <= 'z') ||( kytu >= 'A' && kytu <= 'Z'))
	{
	  //xuly dang la thuong 
		if(kytu >= 'a' && kytu <= 'z')
		{
		    kytu -= 32;
		}
		else
		{
			kytu +=32;
		}
		printf("\nky tu cua ban da duoc thay doi : %c",kytu);
	}
	else
	{
	   printf("\nky tu khong hop le xin nhap lai cam on!");
	}



		
	   
   getch();
   return 0;


}

 

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