程式作業 第4題 for 四子一丙

第四題

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
 char cstring1 ,cstring2;
 
 printf("輸入一個字元: "); 
 cstring1 = getchar();

 if(cstring1 <= 90 && cstring1 >= 65)
 {
     cstring2 = cstring1 - 65;
     cstring2 = 97 + cstring2;
     printf("輸入的字元是大寫%c 轉小寫為%c\n", cstring1, cstring2);
 }
 else if(cstring1 <= 122 && cstring1 >= 97)
 {
     cstring2 = cstring1 - 97;
     cstring2 = 65 + cstring2;
     printf("輸入的字元是小寫%c 轉大寫為%c\n", cstring1, cstring2);
 }
 else
 printf("輸入錯誤\n");
  
 system("pause"); return(0);
}