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];
 * * *  *   * * *  ** ***  i=0,re=0,len;

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    }
}
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Case 0: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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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
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Case 2: Correct output
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Hidden content!
#include **   *  **   **   
#include  *   ****   *  ** *
#include   **** ** ***   ** 

int main()
{
  **** ***   * **   ***   ***    prefix[100];
 *  * *** *  *   *** * *  *** word[100];
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***  **** *    **  ****    * i;
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*** *    ** ** *        *** ***  *** *** **  * **  **  * **  ** *  *  *** ** ** *  0;
******   * *** ***  *** *  * ***         **** *  **     
   **  **    *   *   * ***  *  
  * ***** *   ***** *     ** ** ** ** *    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
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Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include *****     *   * ** 
#include **  *   **  *    

int main(){
**     *** ****  *** * **   * *   p[100],s[100];
*  ** * ***  **  ** *  * **    *     ** **  * * * * 
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 * * ****   *  *  *  **** * ** 

 *  ******  * * *    **    *    ** * 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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0 0
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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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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
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