1 like 0 dislike

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
Available when: 2018-01-17 14:00 - Due to: Unlimited

retagged by | 42 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 (-153 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 (-401 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 (-62 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);
         ^
Get it on Google Play Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:172.69.63.29
©2016-2019

Related questions

1 like 0 dislike
37 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 61 views
2 like 0 dislike
31 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 33 views
1 like 0 dislike
32 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 93 views
2 like 0 dislike
30 answers
[Exam] asked Jan 16, 2018 in Final Exam
Available when: 2018-01-17 14:00 - Due to: Unlimited
| 58 views
0 like 0 dislike
4 answers
[Exam] asked Jan 19, 2018 in Final Exam
Available when: 2018-01-20 09:00 - Due to: Unlimited
| 20 views
8,728 questions
70,471 answers
45,279 comments
1,844 users