1 like 0 dislike
10.5k 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 | 10.5k 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:172.69.214.205
©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
| 10.9k 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
| 9.4k 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
| 11.1k 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
| 8.6k 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
| 2.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users