1 like 0 dislike
10.4k 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 | 10.4k 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:172.70.127.116
©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
| 10.7k 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
| 9.3k 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
| 10.8k 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
| 8.5k 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
| 2k views
12,783 questions
183,442 answers
172,219 comments
4,824 users