1 like 0 dislike
13.1k 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 | 13.1k 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:108.162.216.239
©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
| 12.6k 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
| 11.6k 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
| 13.5k 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
| 10.4k 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
| 2.6k views
12,783 questions
183,442 answers
172,219 comments
4,824 users