1 like 0 dislike
2.2k views

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

 

[Exam] asked in Final Exam
ID: 42299 - Available when: 2018-01-17 14:00 - Due to: Unlimited

retagged by | 2.2k views

37 Answers

0 like 0 dislike
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;
}
answered by (-258 points)
edited by
0 0
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);
           ^
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
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
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
0 like 0 dislike
Hidden content!
******** * * ** * *
* * **** *
int main()
{
** *** * * ** ** ap;
* *** * *** ** *** ***** ** ** ** || ap=a)
**** * * ** ** **** * * * ** * * * is a prefix of abcde\n");
** * ** *
* * **** *
* * * * * ** * * ***** * ** * is not a prefix of abcde");
** * * ***** ** * * * * ** * *** ** * ***** ** ** ** * *** 0;
* **** *** * ** * ** *** *** ** ** * * * * * ** *
  
answered by (-167 points)
0 0
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
0 0
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
0 0
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
0 0
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
0 0
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
            }
            ^
0 0
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
            }
            ^
0 0
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
            }
            ^
0 like 0 dislike
Hidden content!
** *** *
* ** * * * ** * **

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

int test(char p[],char s[],int pl, int sl)
{
***** **** *** ** *** * * i<pl; i++)
* ** ** * *
* *** * ** * **** * * * *** ****** * * ** (p[i]==s[i])
* * * * *** **** *** * ** * ** ** * * *
* * ******* * * * * * * * * **** ** * * * **** * ** **** * * *
* * *** * ** * * *** ** ** ****** * * * ****** * * *** * *
*** ** ** **** ****** * *** ****** * ** **** ******** *** ****** *** *** * * 1;
* *** * *** * * *** ** * * *** ** * * ** * ** * **** * ****** ****
* **** * * ** **** * *** *** *** *
*** * *** * * * * **** * * *** *** * * * * if(p[i]!=s[i])
* ** * ** **** ***** ***** * ***** * *
* *** * ** * * *** **** ****** ** ****** * * ** * * ** * * * 0;
** * * *** * ****** ** ** **
***** ** * ** ****** *** ****
}


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

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);
}





}
answered by (-336 points)
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
0 like 0 dislike
Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
** ** * * ***** * * ***** a[99],b[99];
    int l,i;
*** *** *** ** ** * * * * *
**** * ****** * ** * * * ** *
*** ** *** ****** *** * *** * *
** * * *** * ** ** * * * *** * ** ***
    {
* * * *** ** * * ***** * ** *** * *** **** **
** * ** ** * **** *** ** ** ***
* *** * *** * *** * ****** ** * ***** ** * * ** * *** **** ***** ***** * **** a prefix of %s",a,b);
* *** **** * * ** ** *** * *** * * * ** * ** * * ** ** * ***** ** *
* * *** ** ** * ** ** * * **** * ** * * ***
* * * *** **** * * ** **** * * ** * * **
**** * * *** * * ** ** **** ** * ****** ** ******** *
** * * ** * * * ****** *** *** * * **** **** ** ** ****** * * ** * *** *** * not a prefix of %s",a,b);
*** ** *** *** * * ** * **** * ** ** ** ** * * *** * **
** ** * ** *** **** * * *** ** * * * **** *
    }


}
answered by (-255 points)
edited by
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 like 0 dislike
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;
}
answered by (-193 points)
edited by
0 0
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);
                    ^
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 like 0 dislike
Hidden content!
*** * * * ** * *
*** ** ** *****

int **
{
** * ********* ** *** ** * * ***** no idea, I * even do it in the * ** ** **
** ** * * * * ******** 0;
}
answered by (-168 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
0 like 0 dislike
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);

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

}
answered by (-74 points)
edited by
0 0
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.
0 0
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__;
              ^~~~
0 0
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);
             ^
0 like 0 dislike
Hidden content!
**** *** * * * *
* * *** * **

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

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

** * * ** * **

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

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

}
answered by (-66 points)
0 0
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");
                                 ^
0 like 0 dislike
Hidden content!
***** * * * *
** *** * ** *

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

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

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

* *** ** * *** 0;
}
answered by (-233 points)
0 0
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");
             ^
0 like 0 dislike
Hidden content!
* * *** * **
* *** ** * *
int main (){
char ** * **
char **** * *
* * ** * ** * ** * * ** **
* ** ** * *** * * * *
* * ** **** * *
** ** *** * ** ** * *** *
* * **** *** *
** * **** * is a prefix of ** * ** ** ***
}
else{
* **** * is not a prefix of %s * * * ** *** *
}
* 0;
}
answered by (16 points)
0 0
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);
         ^
Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:172.69.58.104
©2016-2024

Related questions

1 like 0 dislike
37 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42302 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 1.8k views
2 like 0 dislike
31 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42301 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 1.8k views
1 like 0 dislike
32 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42300 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 2.1k views
2 like 0 dislike
30 answers
[Exam] asked Jan 16, 2018 in Final Exam
ID: 42298 - Available when: 2018-01-17 14:00 - Due to: Unlimited
| 1.5k views
0 like 0 dislike
4 answers
[Exam] asked Jan 19, 2018 in Final Exam
ID: 43460 - Available when: 2018-01-20 09:00 - Due to: Unlimited
| 452 views
12,783 questions
183,443 answers
172,219 comments
4,824 users