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 * ** * 
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** * ** *** *       *  **** *   * **  * ** *  
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***** *    *   * ***    * ** ** **   *  ** **       *   *    *   *      
      ** **  * ****  * *  **    ** ** *       *    *   ****  * * {
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  * ** *** * ****  *   *    ***  ** **    ****  * * * *  *  ***  }
* ****    *    ***  ***  *  *** *   **  else  * ** ** **  * **** *  ***   **  *
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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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    *** *** * * * ** 
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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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   *** *****          
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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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 *  * ** * ***** *  *  * * ***** ** *** *  *  * **  **** *********** * *    * *   
**  *  *** * * * * ****   * ****  * **       * * *  *  ***
    }


}

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;
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  **  **         *   * * *    * len;

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

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


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

   return 0;
}


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


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

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

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