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:172.70.80.196
©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