1 like 0 dislike
2.4k 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 | 2.4k 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:172.69.6.143
©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
| 2k 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
| 2k 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
| 2.3k 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
| 1.7k 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
| 469 views
12,783 questions
183,443 answers
172,219 comments
4,824 users