20140527_KUAS_VisualC++_Classwork_0514_Question_3_Answer

/***********************************************/
/** 20140527 Classwork_0514 Question 3 Answer **/
/** Maker  : Yan                              **/
/** E-Mail : [email protected]            **/
/** Date   : 2014/05/27 pm.04:20              **/
/***********************************************/

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

void main()
{
    while(1)
    {
        printf("Please input a string: ");
        char input[20] = {EOF};
        scanf("%s", input);
        if((input[0] == '0') && (input[1] == '\0'))
        {
            printf("See You Next Time! Bye Bye!\n");
            system("pause");
            exit(1);
        }
        else
        {
            char output[20] = {EOF};
            for(int i = 0; i < strlen(input); i++)
            {
                if(((int)input[i] >= 65) && ((int)input[i] <= 90))
                {
                    output[i] = (char)((int)input[i] + 32);
                }
                else if(((int)input[i] >= 97) && ((int)input[i] <= 122))
                {
                    output[i] = (char)((int)input[i] - 32);
                }
                else
                {
                    output[i] = input[i];
                }
            }
            printf("The inverse string is: %s.\n", output);
        }
    }
}