1 like 0 dislike
9.2k 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 | 9.2k 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:172.69.7.77
©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
| 9.4k 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
| 8.2k 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
| 9.5k 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
| 7.5k 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
| 1.8k views
12,783 questions
183,442 answers
172,219 comments
4,824 users