1-11 Exercise 1: UPPER and lower letters

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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.
[Exercise] Coding (C) - asked in Chapter 13: Strings
ID: 41431 - Available when: Unlimited - Due to: Unlimited
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57 Answers

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#include<stdio.h>
#include<string.h>
int main()
{
    int i;
    char a[1000];
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    for(i=0;i<strlen(a);i++)
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}
answered by (-301 points)
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prog.c: In function 'main':
prog.c:7:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[1000]' [-Wformat=]
     scanf("%s",&a);
             ^
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#include<stdio.h>
#include<string.h>
int main()
{
    char a[1000];
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    int i=0,l1;
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    }

}
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#include<stdio.h>
#include<string.h>
int main()
{
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* * *   ** * ***   *    * i=0;
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**** *** *  * *  *   * ** **  ****  ****
    {
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*** *  ** ** * ** **  * * **
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*  * **  ****** **  * *  **  ** 0;
}
answered by (-323 points)
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prog.c: In function 'main':
prog.c:7:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(string);
     ^~~~
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/ccuYke74.o: In function `main':
prog.c:(.text+0x2f): warning: the `gets' function is dangerous and should not be used.
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prog.c: In function 'main':
prog.c:21:15: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(i=0;i<strlen(string);i++)
               ^~~~~~
prog.c:21:15: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:21:15: note: include '<string.h>' or provide a declaration of 'strlen'
commented by (4.3k points)
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prog.c: In function 'main':
prog.c:21:15: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(i=0;i<strlen(string);i++){
               ^~~~~~
prog.c:21:15: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:21:15: note: include '<string.h>' or provide a declaration of 'strlen'
commented by (4.3k points)
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prog.c: In function 'main':
prog.c:21:15: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(i=0;i<strlen(string);i++)
               ^~~~~~
prog.c:21:15: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:21:15: note: include '<string.h>' or provide a declaration of 'strlen'
prog.c:24:5: error: expected '}' before 'else'
     else
     ^~~~
prog.c: At top level:
prog.c:26:5: error: expected identifier or '(' before 'return'
     return 0;
     ^~~~~~
prog.c:27:1: error: expected identifier or '(' before '}' token
 }
 ^
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prog.c: In function 'main':
prog.c:24:5: error: expected '}' before 'else'
     else
     ^~~~
prog.c: At top level:
prog.c:26:5: error: expected identifier or '(' before 'return'
     return 0;
     ^~~~~~
prog.c:27:1: error: expected identifier or '(' before '}' token
 }
 ^
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prog.c: In function 'main':
prog.c:21:15: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(i=0;i<strlen(string);i++)
               ^~~~~~
prog.c:21:15: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:21:15: note: include '<string.h>' or provide a declaration of 'strlen'
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Case 1: Correct output
Case 2: Correct output
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Hidden content!
#include<stdio.h>
  *  * ****  *** *   
int main(void)
{
*  * *    * *  **  **  *    *** str[1000];
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}
answered by (-281 points)
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
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}
answered by (-284 points)
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
 *    *   *** *  **  * *****  * * array[1000]={0};

*   **  **   * *** ** ***   *  i = 0;

*****   ** *  *   * ** **       **  1000, stdin);

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}
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#include <stdio.h>
#include <studlib.h>
#include <string.h>

int main()
{
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* ***   ** * * *   * * *  * i = 0;
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  *   ******  ******  ***  * i<len; i++) 
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* **  *  *  * * *  ****** ** * *      *   **   **   *  ***  **     >=  *   *  *    ******  * <= 'Z'))
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}
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prog.c:2:21: fatal error: studlib.h: No such file or directory
 #include <studlib.h>
                     ^
compilation terminated.
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#include <stdio.h>
#include <string.h>

int main(){
 *  *   * * *    ******     *    *  str1[1000];
*  ** *   *  *********  ***  a,b,c,d;
*    **   ** ***  ** ** **** *** *
 ** *** *** **  **    ****   **    ** 
         ** * *** *       ***  * * * *  ******
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    }
   * ***  ***  *   **  *  ***   *   *    
* * **  *      **** * ******* 0;
}
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#include <stdio.h>
#include <string.h>

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

 **   * ***    **** ***  * ** *   0;
}
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#include<stdio.h>
#include<string.h>
int main()
{
    char a[1000],b[1000];
    int i,j,len;
  *     *    *  ** ** * * *  ** *  * * *  * 
    {
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    }
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  ****  ** ** **** ***   ** * ****    ** * *  ****     **
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    }
}
answered by (-255 points)
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prog.c: In function 'main':
prog.c:11:9: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     len=strlen(a);
         ^~~~~~
prog.c:11:9: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:11:9: note: include '<string.h>' or provide a declaration of 'strlen'
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Case 0: Wrong output
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