1 like 0 dislike
11.9k 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 | 11.9k 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:172.70.50.26
©2016-2025

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
| 11.9k 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
| 10.9k 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
| 12.1k 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
| 9.6k 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
| 2.5k views
12,783 questions
183,442 answers
172,219 comments
4,824 users