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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    *** *       * *****   *  *  * ***   ** ***  * ** *    *  ** 
 *  *   **  ** *  ** * **   * ****** * * *  ** * *    ** {
***  * **               ***  * *** * 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

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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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*  ** *   ** ***** ****   ** * ****  **** *  * **** *** * if(p[i]!=s[i])
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* ** * *  * ***  ** * **    *** *    ***  ** **  ****    ***
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}


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

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

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


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

   return 0;
}


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


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