1 like 0 dislike
2.7k 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 | 2.7k 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:172.69.6.66
©2016-2024

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
| 2.4k 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
| 2.4k 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
| 2.7k 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
| 1.9k 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
| 530 views
12,783 questions
183,443 answers
172,219 comments
4,824 users