1 like 0 dislike

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
Available when: 2018-01-17 14:00 - Due to: Unlimited

retagged by | 42 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 (-153 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 (-403 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 (-62 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);
         ^
Get it on Google Play Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:162.158.79.101
©2016-2019

Related questions

1 like 0 dislike
37 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 61 views
2 like 0 dislike
31 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 33 views
1 like 0 dislike
32 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 93 views
2 like 0 dislike
30 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 58 views
0 like 0 dislike
4 answers
[Exam] asked Jan 19, 2018 in Final Exam
Available when: 2018-01-20 09:00 - Due to: Unlimited
| 20 views
8,735 questions
71,258 answers
45,934 comments
1,858 users