1-11 Exercise 3: Prefix of a string

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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

 

[Exercise] Coding (C) - asked in Chapter 13: Strings by (12.1k points)
ID: 41439 - Available when: Unlimited - Due to: Unlimited
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
 * * * ** **    *** *       ***   ** n[999],str[999];
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***  *    *  * * * ** **     *  * *** **** ****** *    
*  **** *   *  ***  ***  * * *  0;
}
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prog.c: In function 'main':
prog.c:9:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Wformat=]
     printf("%d",strlen(n));
              ^
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prog.c: In function 'main':
prog.c:9:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Wformat=]
     printf("%d",strlen(n));
              ^
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Hidden content!
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***  *  ****      *

int main()
{
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return 0;

 }


if (i==plen-1)
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* *  **  **     **  * ****  


}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
*** *    ******** * *   * *  *    p[1000],s[1000];
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    }
}
answered by (-120 points)
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Case 0: Correct output
Case 1: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

*   *    *  * *   *    *      a[100],b[100],c[100];
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    }
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    }
}
answered by (-329 points)
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prog.c: In function 'main':
prog.c:8:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
             ^
prog.c:8:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
               ^
commented by (4.3k points)
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prog.c: In function 'main':
prog.c:7:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
             ^
prog.c:7:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
               ^
commented by (4.3k points)
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include * * **   ***
#include * * ****   *
#include ***   * *   *  *

int main()
{
 *  *  ** *  *** *  * ** **  *  prefix[100];
   *** **  *   **** * *  **** word[100];
   * *   ** * **  ****  ****  *           %s", prefix, word);
*****  ***    ***     **  i;
****   *  * * **  * **  ***** *  = 0; i< strlen(prefix); ++i)
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    ** **  ****  *  * *** ** * * * ***** *  ** * ** * ** *    *** **** * ***** * ** * **  ** is not a prefix of %s", prefix, word);
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 **    * ** ***  * * **  * *  *** *   * ****   *****
 * * ** *  *  *   ** * **   * 
 **   * **  *   * *   ************ * * is a prefix of %s", prefix, word);
 *  * *  *  *   * **    ** * **** 0;
}
answered
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0 0
prog.c: In function 'main':
prog.c:15:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
prog.c:17:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:15:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
prog.c:17:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
commented by (4.3k points)
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include          * * 
#include * ** **   *   * 

int main(){
* * * * * **** ** * **   p[100],s[100];
*  **    * * *        ** ***  *  ** **   *****  *  
 * ***  **      * ***  *  * bf=1;
**      ** ** *     ***   * *    ***********    * 
***** *** ** ****** *   *   *   ***   ** *    ***   ** *   *      * bf=0;
 * **** * ** ** *****  ** *

* * **** *     ***** * ***** ***    **  is a prefix of %s",p,s);
   *   ** * *     * **** **    *    *    *    is not a prefix of * * *    
** ******   ***    ** *   ** **** 0;
}
answered by (-116 points)
0 0
prog.c: In function 'main':
prog.c:5:5: 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:6:5: 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__;
              ^~~~
prog.c:8:19: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(int i=0;i<strlen(p);i++){
                   ^~~~~~
prog.c:8:19: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:8:19: note: include '<string.h>' or provide a declaration of 'strlen'
/tmp/cclwPOj6.o: In function `main':
prog.c:(.text+0x26): warning: the `gets' function is dangerous and should not be used.
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prog.c: In function 'main':
prog.c:8:19: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(int i=0;i<strlen(p);i++){
                   ^~~~~~
prog.c:8:19: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:8:19: note: include '<string.h>' or provide a declaration of 'strlen'
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
 * **  *** * ***    **   i,count=0;
**     ***  *     **    *  ***** string1[100];
  *** **  ***   ****   *  string2[100];
        **  *   ** **  ****  **    * *** *  * ***
* * ** *** ** *  ** **  **  **     *****  * 

* *     *   ***** * * * *   *    ***   **
 *** *** ** **       ********  
 * * *    * * *  * ** ** *    *  **  ** * ****** **** ***    * *    *   * 
*  ****    *  * **  *  *     * *    *   *** **** * **   *
   **      **     * **  *   *   *   *** **    **          * **   * * *   *  **   * ****
******* **   *  ******* *    **   * * ***  **** *  **
    }
* * *     ** **   ** ** * * * ***   ***
* * ****** * ** **  ****
*   ********  **  * ** * *    **** **  ** *  **   ** * * ** ** *   *   * * *   * is a prefix of %s",string1,string2);
 ** *** *  *       *       
* ***  * * ***  ** * ** *** * *  
***  * * ***   **** ** ** ** * *
    *     *** **    *   **  ***    *  **** *  *   * ** *     * **  ** * is not a prefix of %s",string1,string2);
**  * ****** ** * *** *  *
****** **       * *** *** * *    0;
}
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prog.c: In function 'main':
prog.c:9:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(string1);
     ^~~~
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:10:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(string2);
     ^~~~
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/ccIBxtbQ.o: In function `main':
prog.c:(.text+0x2f): warning: the `gets' function is dangerous and should not be used.
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Case 0: Wrong output
Case 1: Wrong output
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0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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