1 like 0 dislike
15.9k 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 | 15.9k 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:104.23.243.109
©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
| 14.4k 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
| 13.7k 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
| 17k 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
| 11.8k 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
| 3.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users