1 like 0 dislike
15.5k 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 | 15.5k 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:162.159.115.32
©2016-2026

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
| 14.1k 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
| 13.4k 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
| 16.6k 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
| 11.5k 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
| 3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users