1 like 0 dislike
15.5k 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 | 15.5k 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:104.23.197.65
©2016-2026

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
| 14.1k 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
| 13.4k 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
| 16.6k 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
| 11.5k 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
| 3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users