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
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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()
{
** * *** ** *******   *  ****  *      string[1000];
 *       *** *****     ***   i=0;
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    {
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}
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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'
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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
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Hidden content!
#include<stdio.h>
 *  *** *******    *  
int main(void)
{
  *    *       **     *** str[1000];
*******  *** ***** * *    ***   i,temp;
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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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}
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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

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******* *    *  * *  * **  **  * * 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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}
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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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    }
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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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    }
}
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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