Final Exam 2 (20%)

Question

A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如，"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

Answer 1

Hidden content!
 *  * *   *** *   ****
* * ***  ** ****   * * **

int main()
{
** **  ****  * char *   *    
    **      int i,c=0;
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**** *   *** *  *  *** ****  * *    *
*   *  *      * {
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* * **   * ***      **   ***  *  {
**  * **  *   *  ***  *  **   * **  * * **   ***   *     *** 
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* *    *                  *   * * *  c=0;
*****   **  *** * *  **  **      *   *   *  * *     }
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     *      *     ***** * * *       *****   *** * **    * *  {
*******   **  **** **      *  *** *****   * ***      *      *    *  ** *  **   c++;
  **   *      *** ***  ** * *      ** * * *    ***  **  * }
** ** *** ** * *  ***  * *  *  * }
**   * *   ***** 
 *   * **  * * * * if(c==0)
*** * *    * *   * **  *   * *  *** *  *** is not a prefix of   ***  ***** 
*  ****   ** *   else
   ** * * *   * * *  **** *    * ** *  *    *  is a prefix of *   *    *
 * **  *****  *  }
       **  *  ** * return 0;
}

Comments

prog.c: In function 'main':
prog.c:8:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&a);
           ^
prog.c:9:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&b);
           ^

---

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

---

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

---

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

---

prog.c: In function 'main':
prog.c:10:6: warning: implicit declaration of function 'stlen' [-Wimplicit-function-declaration]
   if(stlen(b)>strlen(a))
      ^~~~~
/tmp/ccnE3ufV.o: In function `main':
prog.c:(.text+0x5b): undefined reference to `stlen'
collect2: error: ld returned 1 exit status

---

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

---

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

---

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

---

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

---

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

---

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

---

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

Answer 2

Hidden content!
****  *   *** * *  *** 
*  **** ****   ****** 
int main()
{
** * *  *      *   ap;
* **  ** * *  *     * ** * ** * * *** ***** *** * || ap=a)
   * *** * **   * **  **** *** **  * * ***  is a prefix of abcde\n");
  **  ****  **
*   *  ** * *  *
*      **  * *    *  * ***** ** * ** is not a prefix of abcde");
** * *   *  ********  *   *   **             *  ** **  *** * ******* 0;
  *  *  ** * * * *  *         *   *  ***  **  *  ****     *****  *   *** * **   
  

Comments

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

Answer 3

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char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
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***** **** *   *     ** 
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}


int main()
{
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* * **  **   *** **  ***  

sl=strlen(s);
pl=strlen(p);


***    ***   *  && pl<sl)
{

   *      *   * *****   ** * ***   *  * ** is a prefix of %s",p,s);
}else
{
printf("%s is not a prefix of %s",p,s);
}





}

Comments

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

---

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

---

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

Answer 4

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
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    int l,i;
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* * **  *     *  *   *       ** **  
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    {
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* ***  *  * ***  *** * **  *** *  *****  *  * 
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 *  *** * *** **      * *** * ****** **  * ** **   **** * **
* * *  *   * **  * *   ** ****     * *  *** *      *******
* * ** ** ** **   *      * *****  * *  *  *  *  ** *  *****  ** * *  **  **  *  * **   *  not a prefix of %s",a,b);
 * ** *** * * ****    ** * **  *  *****   *   *  **  * ****** * ***      * * *  ***    *
     * **  ** ** * *      ** ****   *  ** ** *   ** **  **  
    }


}

Comments

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

---

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

---

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

Answer 5

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

int prefix(char a[100],char b[100]);


int prefix(char a[100],char b[100])
{
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*  * **    * * *  *     count=0;
*   * *** ** *  **   ********     len;

 **  **      * ***   * * *

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


* ** ** *** ***  **   * **  ** *
 **       ** ** *  ** * * 
 ** *   ** **    **** *** *** ***  * ****    ***   *   * * ** 1;
* **** **** **   ****   ***
** ***   * ** *   * *****   *   

   return 0;
}


int main()
{
*   ** **  * * *** **  ***  * * ** a[100];
   * ***    *    ** *      * b[100];


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

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

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

 {
*   * *** *   ** **   ***   *  *    * **** *  *** ** **  *********  ** is a prefix of %s",a,b);
********* *** ****  ** *  
* **** * ** *  * ** * ** *** *
* *  **  ****      ****   *    **
 *  *****  ******* **   ***   *  * **  * * **  ***  *** ** ***     **  * *  is not a prefix of %s",a,b);
*   ** **  * ********* *  *  *  


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

Comments

prog.c: In function 'main':
prog.c:45:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&a);
               ^
prog.c:45:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&a);
                    ^
prog.c:46:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&b);
               ^
prog.c:46:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&b);
                    ^

---

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

---

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

Answer 6

Hidden content!
    * * ** ***   **        
***       *  *   ** *

int     
{
 **  *    *  *       **      *   **    no idea, I  * * even do it in the  ******* * ** **** *
*  ** * *  *** *    * ** ** * 0;
}

Comments

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

Answer 7

Hidden content!
#include   ***   **** 
#include *  **  * ******** *
#include  * *  ** **** ** 

int pref(char[],char[]);

int main(){

  * *  ** *  ****** * * *   ** p[10],s[10];
 *  **** *** *  ********  **   num;

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

*   * *    *** **  ** **** * = pref(p,s);

**  **  *** *** ** * *   *
 **  *   * * **  *     ****** *  *    ** **  * **  *  * * * * ***   is a prefix of %s",p,s);
* *   *     ***     ** * *  * ****
*** *** *   ** * *** *  **  ***** * * * ****      * *    *  ** * ** is not a prefix of %s",p,s);


 return 0;
}

int pref(char p[30],char s[30]){
   *  *** **  ** **  *** **  i;

* **  ** *** ***** ******  **  *      *    * **
***** ** *  *      ***   *  * ***** *  *     **  *  *  *  ****** *** *****   *    *  *  * * ** *    *
  * *  *   ***  * * ***      ****  *  ****      *  ****   * * ***        ****** * **  *** ***   *   is a prefix of %s",p,s);
*****     **** **** * *  *    *  *   ** ****   ** 
*    *  *  *  * *    ** *  *  ***  *  * **** *   ** * * * ***** * *** **   ** * ***  *** **  ***** * is not a prefix of %s",p,s);

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

}

Comments

prog.c: In function 'main':
prog.c:12:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
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:13:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
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/cc0tBG5r.o: In function `main':
prog.c:(.text+0x1f): warning: the `gets' function is dangerous and should not be used.

---

prog.c: In function 'main':
prog.c:10:13: error: stray '#' in program
     int num;#include <stdio.h>
             ^
prog.c:10:14: error: 'include' undeclared (first use in this function)
     int num;#include <stdio.h>
              ^~~~~~~
prog.c:10:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:23: error: 'stdio' undeclared (first use in this function)
     int num;#include <stdio.h>
                       ^~~~~
prog.c:14:1: error: expected expression before 'int'
 int pref(char[],char[]);
 ^~~
prog.c: In function 'main':
prog.c:23:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:24:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
prog.c: In function 'main':
prog.c:51:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
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:52:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
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: In function 'main':
prog.c:14:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:15:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^

Answer 8

Hidden content!
 *  ***** *** 
 **    **  **    *

int main()
{
        length1, * ***** c;
 *** ** a[100];
 *   **  b[100];
*  *  ** * * d[100];

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

****  * *  *****

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

  **  *    *  ***
   *  
**   **  *    ** * *  * *  is a prefix of        ***
   *  * 
 *   *  **  ** *
* * * **  
***    *  * *  **  * is not a prefix of *    *     
  *    

}

Comments

prog.c: In function 'main':
prog.c:11:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&a);
          ^
prog.c:12:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&b);
          ^
prog.c:24:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
           ^
prog.c:24:33: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
                                 ^

Answer 9

Hidden content!
**  **   * ** **  *
* * *  * ***     ***

int main()
{
  *   ** ****   ** ***   *    str;
**      *  * *****  *** *** i, p, s;

**** ****** ** **     **   ***  *  **      * ** * &p, &s);

   **     * ** *    **  **    * ** (i<=0; &p; i++);
 * **  *****  * *     * ***
 *   ***    **    ** ** ***   ***** **     *** ***  * &p);
*    ** ****   *  ** ** ** * **  *  * ****   ***
  **** *** *  *   ****   *  
*  *  *   * ** * **      

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

Comments

prog.c: In function 'main':
prog.c:12:7: error: expected '(' before '{' token
     if{}
       ^
prog.c:13:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("abc", &p);
            ^~~~~
prog.c:14:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
     scanf("%d");
             ^

Answer 10

Hidden content!
  * * ** **  *  *  *
  *  *      *  ****** ** *** 
int main (){
char  ***
char **** *  **
   ** *  **   **  **  * *** 
* * **  ** *    ***  **  ** * 
    *  *****   * **  ** ** *  *
***** * *  *    *    ** ***  ** 
* * ** *   ** **  *  * *
 *   ** *     *  * is a prefix of *   *  * * * ** * **
}
else{
* *** * **** is not a prefix of %s  **  ******    ***    * 
}
*  *   0;
}

Comments

prog.c: In function 'main':
prog.c:7:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string1);
         ^
prog.c:9:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string2);
         ^