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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}
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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;

 }


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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()
{

** *   *  *******  *  ******* a[100],b[100],c[100];
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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];
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*   *   * ** * ******  **** **    *     %s", prefix, word);
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***    *  *   *    *   ** ** **    = 0; i< strlen(prefix); ++i)
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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 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];
**   *   **  * * ***  *    ** *** ** ** **  ** * * **  
* ****   **   *    * * *   **     *     **  *  *

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 *  * *  *   ** **  ** **  *
 *  *   ** ** **  **    ** * **  ***     *****  *** *   *** ***  *       
**  ** *** * * * *** *  * ****  * *  ** *   * **     
 * *  *     * * **      * *****  *  * * * **  * **    * **  *    ***   **  *      
**   *  ** * *   * ***** * *    *   ***   * *    ******   
    }
****  *  *******  **  *  ***    **
*  * **  ** **     * ** ** 
***     *  * * * ****   *  * * *** *   *     **  **  * *** *   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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Case 2: Correct output
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