1-11 Exercise 1: UPPER and lower letters

Question

Write a program that reads strings of up to 1000 characters continuously and displays them, after replacing the lower letters with upper letters and vice versa.

寫一個程式 輸入一個字串(最多1000)  把小寫轉大寫大寫轉小寫

Example input:

With the rise in GLOBAL warming and increasing POLLUTION levels, it is becoming essential to find a viable alternative to the internal combustion engine petrol powered CAR.

Example output:

wITH THE RISE IN global WARMING AND INCREASING pollution LEVELS, IT IS BECOMING ESSENTIAL TO FIND A VIABLE ALTERNATIVE TO THE INTERNAL COMBUSTION ENGINE PETROL POWERED car.

Answer 1

Hidden content!
#include "stdio.h"

int main()

{

 ***  * ** * * * * ** * *   * *   *   *** *  ch[1000]={0};

 *   ** * **  *  *  **** ** *  *** **** ***  i;

**** * *   * **  *** * *  ** * *    * *  *** *  **  * *   

     * ** ** *   ****  *** ****    *     **    **   &ch);

***  *** ** *  *  *     *******   *************** ** **

     *******  ** **  **     *   **  * * ** *** **          *  **   && ch[i]<='z')

  * * ** *****     * **** *** **  * ** ***    *      *         *    **  * *      *   ****** *     *  * * *

* ** *   **   ****** ****   ***   * * *** **        * *** if(ch[i]>='A' && ch[i]<='Z')

**    **** *  *** ***** * * * *  * **  ** *   *  **  ***  *  *      **   * * *    ****   *   * *   * *

   * ***  *   ** *** ****  *   ** *   * **    **    * *  

  *  ****  * * **  *     *   *  *****   ** ** * 



}

Comments

prog.c: In function 'main':
prog.c:11:14: warning: zero-length gnu_printf format string [-Wformat-zero-length]
       printf("");
              ^~
prog.c:13:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[1000]' [-Wformat=]
     scanf("%[^\n]", &ch);
               ^

Answer 2

Hidden content!
#include <stdio.h>
#include <string.h>
int read_line(char str[], int n)
{
int ch, i = 0;
while ((ch = getchar()) != '\n')
if (i < n)
str[i++] = ch;
str[i] = '\0'; /* terminates string */
return i;
}
int write_line(char str[])
{
** ** *  *** * * *** *** i=0;
 ******** * *    * *    * * ***  * *********** * *
   *  *******    * * *  ***** **   **   * *** *    **  * * *    *  * * ***  * *      * *    **    *  **  ****


   **  ** *   ***    ****   *** * * ** **  **     ** 
* *  *      **  *    * * * *    i;
}
int main()
{
* * * * **  *   *  * * ** *****   * str[1000];
*    **  *  ** **   ** *** *   *  i;
  **  *  ***           *   *** ** *   ***
*  *  **  *        **  **  ***  *  *  ** * *
    {
**** * ***    ** *  * **      ******* **** **   ** * ******     **     * ** ****       *  * **
* **  *****   * *  ** **    **  *   **   ** ***     *
 *      * ****   **  **   * ***  *** ** **  ***   **** * **   * ***** **  **  * ***  **
   **  *  *  ***    ****   *   * *** *     ** ** 
 ** *   **   *   * *   * * *   **   *  * ** ** * ** ** if *  *      **  *        **  ***        *  *  
 *   *      *  *** * ***** **   *   *** *  *     
 * ** **    *  ****  **    * *** *** * ****** * * *   ***** * **     ** * *      * **    
  **** *** *        * * * *** *  *          *
 ***   * ** **  *** ***   ****
* ****** ***    * *        ******

    *   ** * *** **    *   **  * 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 3

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

 * * ****   * ** * ** *  **  i;
 ******  *  ** * * *  *   *  * str1[1000],str2[1000]={0};
 *** *  *    ****  *   *  * **  ***      a sentence to convert upper to lower and vice versa\n");
**  ** *** *    *** ** * ***  * **   **
** *    *  *    * *  ** *    *** * * ** *

*** *     * *      * *****  ** **  ** * * * * *  
    ** *    *  ***   * *
  * *   *  ****    *    **  * **  ***  *** *** * ** *** * **  *  ** * &&str1[i]<='z')
    * * *  ****      ** * *** ** *  *           *  ***** 
* *******   *   ** ***** *** ***    * ***    ** *  **   *  *   ** ***  *  **   *  ** * **  ** ** ** * *  
 **   *   * *  * * **  * * **   * *  * * **  * * ***
 * **** *  *  **** *  ****       *  * *  * ***** *  ****   * * *    * ******* *  * *  ** *** **** 
  ** *   **   ****  **  ** * *  *** * *****  *  ** *  **      ***    **    *** ** *  *   *   **  
 **  *    ****** *    **
   * *  *  *  **********     *   
*****  **   *******  *  ** ***      ** **  *        *  *        * 
 ** *** * **** **       *   **
}
printf("%s",str2);
return 0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 4

Hidden content!
#include<stdio.h>
#include<stdlib.h>
  * * *   * *  * ***  
int main()
{
*  ** **  * *    *     *** *    S[5000];
  *  *** * *    * ** **      *** ****  5000, stdin);

* *  **  * ***  ** **    a,N=strlen(S);   * ** *   * * ** *****  ** ** 
 ***   *** * * **  *   *  *      *  *** *  
*    ****  **            ** *** * **  *   ** ** *  *  *** *  *     && S[a]<='z' )  //大小寫轉換
**** ***  * * *   * *****  ****  **  * ** ** *  *******  **** ***  *  * * * * * *    ** ** ******   * ** *    **
 *  **  **  * *  ***     ** **** *  *  * * ***  if    * * *  * **  *  *   *  S[a]<='Z')
* * ******  *   *    * *   *   *****    *  *  *** * *  * **  * *  ** *     *  *  * * * ** ** * **  *  ** **     *  *  *
  **** *  **  **   * *   * *** **  *  * * * * **   **   *  * * 
*  ****  **** * *    **   *  ********  ** *  ** *  * *   * * *   *   * **** * ***  *****  * **  * * *       * *

 return 0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 5

Hidden content!
#include <stdio.h>
#include <string.h>
int read_line(char str[], int n)
{
int ch, i = 0;
while ((ch = getchar()) != '\n')
if (i < n)
str[i++] = ch;
str[i] = '\0'; /* terminates string */
return i;
}
int main()
{
 *** * * ** * * **  **   *       str[1000];
 ** *  *    **   ** ***   ****  i,a,b;
*  ****  * *  *  *** ***  *** ** * * ***
 ** ***** **  **  * *  *       **       ***   ***  **
   *  *   *   *** ** ********** * 
*     *  *** **  ****  ***** *** *   ****** **  * * *** *   * ******    * **  ** ** *   ** * *  ** 
 *****  *** *  *** *  **  **  ****** *     
* ** ***   * *   * ***** * * *****  * **    *  ** ***   ** ***  * ***  *  * **** *** ****
    * * ** * * *** ** *  **   *  * *** *  ***      *  
   *     * *** *******  **  * ***    ***  ** *     *   ****  if  * ** ****  ** **   **  * *  ** *        
 ** *   *** *  *** *   ***    * **  *  *      * * *  
**     *** ***   **  *  **      ** * ** ** * *  ***   * **  **   ***  ***  * ** * 
 **** *  * **** ****   *** **   *  * *   *  ** *   * ***  
 *   * **     ** * **
  * ***  * * ** *  *   ** *
***** * **  *    *  * * * *  0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 6

Hidden content!
#include <stdio.h>
#include <string.h>
int read_line(char str[], int n)
{
int ch, i = 0;
while ((ch = getchar()) != '\n')
if (i < n)
str[i++] = ch;
str[i] = '\0'; /* terminates string */
return i;
}
int main()
{
    *  *******  *   *  * str[100];
**   *   **  ***  ** * * ***** i,a,b;
* *  *  ** * *   ***     *    ***** ****
**  * ** *   *** **   ** * **** *** ** * **  
  *  *  * ** *   * * **** ** * * 
** * * *      ***  *  * ****         * **** *   * ** ****   ** *  *   **    * **** * *****
 ** * *******  ** **** ** * **  **     ***   * ******
*  * *    **** ** *     ***      * ****   ** *** * * * * **  **    * *     ** *** **** **   
   *  ****   ***   *  *    *  *  *  **  *  *   * *  
*****   ** * *** ***     **** ** *** *     *  * ** *  *** if  *     * *** ** *  *  **   * *  ****
 *  *** *** ********   ****     *    *  * *  * * ***
 **  ***  **     *  * * * ****   ** ** **  **** * **** **  *****  ** * *    **  ***  *** * *  ***
   ** ***     *  * **   * *** *** ***    ******   **   ** 
** * ***** *  ***** **     
  *** ******* ****  * *** ** ****
   *****      * *   ***  *  *   * 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 7

Hidden content!
#include <stdio.h>
int main()
{
    char a[1000];
    int i;
*  * *** **   *  * * *****  **  *
* *   * ** **  *****  ***  ****** ** *   *  ** 
 * *** ** ******  * * *     *   **** *   ***  ****   * ** **** *  * ***** **    * *** *  ** *  
**  *  *** * ***  * ***  * *  ** * * *  ****  ** ** * *  * ***  * ****** ***  *   * **    
*     ** ***   * **        *      *      * **  **  *     ** * * ** * * *** **   *   * * ** *    *
   * * *** **  ** ** * *      *  *** ***  * *   **  ***      *  *  ******     *
 **   ** *  ** **  *  ***   *  *  
  *  *******   ****** *        *    0;
}

Comments

prog.c: In function 'main':
prog.c:6:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(a);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cckMIBeA.o: In function `main':
prog.c:(.text+0x25): warning: the `gets' function is dangerous and should not be used.

Answer 8

Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
 * ** *  **  *****     *  *   str[100];
    int i,a,b;
  *** *  * ** *   *  ****  ***   * 
** *  ** *    **  *   **    * *  ***** * *    ***
    {
**  * *  * ** **  ****  *  * * * *      * * ***  * *        ***   * *   *** *
    ** *****      *  * * *** *      * * *  * *  **      * *
 *  *   *  *  **   ****     *   *** ***       **    ** ** *  * * * ****    **  ** *   **  ** *
 *  *   *  ***  *  * **   * *  * ** *  * *  ***  ** ** 
** * *  * **  **   **  * **  *   ****   ****** ** *   *  ** if  ***  * *** **   **   *** * * **
*** * **  * ***   ***  *      * *   * ** **** * ****
 *****  *  ** * ** *    *    **** * *  *** **  ** * * * ** **  **       * **
 * *   ***        * ** ** **    **** ** ***** **    * 
    }
*     * ** * * ***     *   ** 
 * ****** *  **   * **** ***** *  0;
}

Comments

prog.c: In function 'main':
prog.c:8:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(str);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc7O3tJu.o: In function `main':
prog.c:(.text+0x23): warning: the `gets' function is dangerous and should not be used.

Answer 9

Hidden content!
#include <stdio.h>
int main()
{
    char str[100];
    int i,a,b;
      * * ** *     *  * **   ** * ***
* ****  *****  **  * *    *  *  *  * *  * **  ** 
    {
 ** **   *   ** ** *    **   *   *   *** *  * ****** * *  *   * *  ***  *  ***   *  ****   *
 ******** *  * *  * *** ****  * **  ** * *  ***  *    
      * *******  * *  * *     **** * **            **** **  * ***  *  *** * *****  
   * **  * ** *****  *  *  *   **  ***  *****    *** **  
*** **   *  *  ** **  * *  *    * ****    *     ***    * if * * ** * *** *  *   ** *    **** *    * 
 **   *** *      ** ***** **  * *** *  * *** * *  **
 ****    **  *  **    * *  * * *** *** *** * **  *  ***   *  * **    * *** ***** * **  * * ** 
* ***         ** *  *     *  ** * * **    *    *   ***  
    }
** ***   **** *  *  *     *   * * *** **
  *   * **  * *  ** *     ** **  0;
}

Comments

prog.c: In function 'main':
prog.c:6:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(str);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:7:15: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(i=0;i<strlen(str);i++)
               ^~~~~~
prog.c:7:15: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:7:15: note: include '<string.h>' or provide a declaration of 'strlen'
/tmp/ccX2gnMW.o: In function `main':
prog.c:(.text+0x23): warning: the `gets' function is dangerous and should not be used.

Answer 10

Hidden content!
#include <stdio.h>
int main()
{
    char str[100];
    int i,a,b;
***  * **** *    *****  ** **        **  
 **** ***  * * * *** *  *       ** * *** 
    {
 * ***  ** ** *  ** *******  **  *    ** * *  ** *** *** *  * **   *** *   * *** 
*   **  **  *   *    * * *** ***  *********** ***  *******
  ***  ******     * *** * ** * * * * *  * **  *   ********* *   *** ***  ** ***  * *   ****   
  * *    **  *  * ****  *** *****      **  ** *     *   
*   * *  ** *** *       *  *  ** * *   *******   **  *****  if    *  **  *   * ** * * *   ** ***  *   *
  *   *    * * ** **      * *    ***** *  **  *    *** **
* **  *  * *  * * *      **** *** ***  ** *   ** * **  **  *  * **  *  *  ***  *   * *
 *     ** *   * * *  *  *   * **       *  *   * * 
    }
** **  ** *    * ******    *   *   
* ***     **   * **  *    *** 0;
}

Comments

prog.c: In function 'main':
prog.c:6:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(str);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:7:15: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(i=0;i<strlen(str);i++)
               ^~~~~~
prog.c:7:15: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:7:15: note: include '<string.h>' or provide a declaration of 'strlen'
/tmp/ccxAMu40.o: In function `main':
prog.c:(.text+0x23): warning: the `gets' function is dangerous and should not be used.