1 like 0 dislike
2.3k 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 | 2.3k 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:172.69.58.19
©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
| 1.9k 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
| 1.9k 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
| 2.1k 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
| 1.6k 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
| 467 views
12,783 questions
183,443 answers
172,219 comments
4,824 users