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
edited by | 19.9k views

57 Answers

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Hidden content!
#include "stdio.h"

int main()

{

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}
answered by (-284 points)
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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);
               ^
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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[])
{
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}
answered by (-196 points)
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#include<stdio.h>
#include<string.h>
int main()
{

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}
printf("%s",str2);
return 0;
}
answered by (-167 points)
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Hidden content!
#include<stdio.h>
#include<stdlib.h>
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}
answered by (-127 points)
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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()
{
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}
answered by (-196 points)
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Case 2: Wrong output
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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()
{
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}
answered by (-196 points)
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Case 0: Wrong output
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commented by (4.3k points)
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Hidden content!
#include <stdio.h>
int main()
{
    char a[1000];
    int i;
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}
answered by (-284 points)
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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.
commented by (4.3k points)
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
 *****    * ** **  *** *  * **** str[100];
    int i,a,b;
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}
answered by (-196 points)
0 0
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.
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#include <stdio.h>
int main()
{
    char str[100];
    int i,a,b;
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    }
  * *   ***     * * * * * **   * **  
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}
answered by (-196 points)
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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.
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#include <stdio.h>
int main()
{
    char str[100];
    int i,a,b;
** * *  *  * *  *  **  * ** *  
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    {
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    }
**  ***  *  *** ** ***  ** * *  
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}
answered by (-196 points)
0 0
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.
commented by (4.3k points)
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