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 | 34 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 (-383 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:162.158.79.71
©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
| 44 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
| 30 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
| 56 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
| 56 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
| 18 views
8,391 questions
65,934 answers
40,505 comments
1,520 users