1 like 0 dislike
11.3k 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 | 11.3k 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:172.69.214.39
©2016-2025

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
| 11.3k 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
| 10.2k 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
| 11.7k 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
| 9.2k 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
| 2.4k views
12,783 questions
183,442 answers
172,219 comments
4,824 users