1 like 0 dislike
8.5k 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 | 8.5k 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:172.70.130.221
©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
| 8.8k 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
| 7.7k 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
| 8.9k 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
| 6.9k 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
| 1.7k views
12,783 questions
183,442 answers
172,219 comments
4,824 users