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 | 34 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 (-383 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:172.68.65.252
©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
| 44 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
| 30 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
| 56 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
| 56 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
| 18 views
8,391 questions
65,934 answers
40,505 comments
1,520 users