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 | 44 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 (-403 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:173.245.54.43
©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
| 34 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
| 99 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
| 59 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
| 21 views
8,792 questions
72,361 answers
47,172 comments
2,043 users