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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{
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return 0;

 }


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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() {
* ****  * **   *   *** * **  ** 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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Case 2: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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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)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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Hidden content!
#include  *   ** * * *  * **
#include  *  *  ********  
#include    * *** ***    

int main()
{
 ****  **   * * * *   * prefix[100];
   *     * * *   **  *    *  * word[100];
* ** * * * *  **  **  ****   *  **   *** %s", prefix, word);
* ***   ******* * *** ** *    **   * i;
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* **** * * * * *   *****   * *  * * *** *   * *   **** ** * **  **      ***  ***  **** 0;
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* **      *  ** ** *    * ***  * ***  **  ** is a prefix of %s", prefix, word);
   * * * ** ** ****** ***  *** 0;
}
answered
edited by
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];
******** **    * ***     ** *  *  * ***** *   
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* * *     ******  *        *  **    ***  ** 
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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
Case 0: Correct output
Case 1: Correct output
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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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0 0
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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