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;
** *       *     ** *   ***  *  *   ** **       **
   *     * *   *  *   *   **** *      *    * * 
 **** **   * **  ***  * ** ** * ***  ** ***
***   *  **  {
**   *  ***   *** ** ** *** **     
 * ** ** *    **   ** *****  {
           *** ** *  **  *  *** ***  **  **       ** * *  ** *  **   
** *    ***  * ** ****  ** *** *   *     ** * *  **   ****   {
*    *               ***    *** ** ** c=0;
*    *   * ** *  ** **  *  * ***** *   *  *      *  ***     * ***  }
  * ****  ****  *  * * * **  *    ** *   **  else *     ***** **   *  * * *  
 * **     *    * ****   **  *      ****   **         **  * {
** **  **  ***     ****  ***   *    **   ****  **  **  * *   ** *     ***  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

Hidden content!
*    *   **   *  *
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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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*   **  *** *   * * ***  *  **** ** **** **  *     ***      
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*  *  *  **  *  *** ******   * * *  *  ** * ***   *  ** **  * *    *** ***  * ** * 
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****   ******* ** **  *** *** *****  ********* **  ** *      ** ** *  *  **  **  **
* ****** *  *   **** ******   *  **   ***  *   ***** **
  *  * ***** ***  *   **** * ***** * ** ** ***   ****  if(p[i]!=s[i])
   *** * *   ** *  ****      *** *    * * *   *
* *  * **** * ** *  * * *    * ***   * ** *     *  **        ** ** * *  **** *   **  *** 0;
*  * **     ** *  ** *** ** **  * * **   ***    *  **** ***  
 * *   *** **** **   ** 
}


int main()
{
*  ****  **  
*  ** *   ****  
** * * *    *     ",p);
 ** *   ****** * ** * **  
* ****   ** **    *

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


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{

*     **  *  * *  ** ** ****  * *   **  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()
{
 *     *     * **  **  * ****** a[99],b[99];
    int l,i;
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 ** **  * ***  ** * ** *  ******  ***
***   *  * ** * **  *  * **   * **** *  
*  *  **    * ***   **** *  *  **  **** * *
    {
**  * *******  **    * *   ***       *   ******    ** ** *****
** ***** * *     *  ** ****  *   *****    *    *   *
 **    **  ****       *  **     * **    *  *** *  * **     ***    * * * *  ** **  *  a prefix of %s",a,b);
 ** * ** ***   ****  ******  * ** * * ***  ** *   ** ***  * *  *  * *  **** ** *   *
 *** * *     *  *    *     ** **   *****    * * *  ****
 **  ** * *  *** **  * * ** * * **  *****   ***   *   **  *  
* * * * * *  ** * *   **    *    *  *******   * * 
** * **   * * * ********* * *  **   *  *  ***    * * ******    * **   *    *** *** *  **   * *    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])
{
*  * * * * *** ** ** * * *  *  ** ** i;
* **      *****    * *  *   count=0;
** * * **  ** * * * ** len;

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

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


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

   return 0;
}


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


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

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

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

 {
 **  *  *  * *    *   *    **  ** * * ** **** *  * * **** *     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);
         ^