1 like 0 dislike
13.1k 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 | 13.1k 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:172.69.59.247
©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
| 12.6k 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
| 11.6k 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
| 13.5k 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
| 10.4k 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
| 2.6k views
12,783 questions
183,442 answers
172,219 comments
4,824 users