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)
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Hidden content!
#include * * *** * ** ****
#include * ***** ** ** *  **

char prefix(char s1[], char s2[])
 {
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}
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Hidden content!
#include ****  **  *     *
#include * ***  **    ***  

int prefix (char st1[],char st2[]){
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
    **   *** * ** * *          *        *    * * *
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    int i;
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**              *    * ****    * ** 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
   * *    *     * * *  * *  *  a[100];

* *      *  *  * *  * *    *   ** b[100];

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*  **      * *  **   * * 
}
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Hidden content!
#include * *** *   *    ** 
#include      *  *   ** ** 

int main() 
{ 
 *** * *** *   * **    ***  **   a[100],b[100]; 
**    *  *  *    * ** *    ****  i,j,prefix = 1; 
   ***** *** * *  **** ** *  * ***    * %s",a,b); 
 ****  ** ** ***    **  * *  * len = strlen(a); 
 *  *  **    ****  *** ***  * = 0 ; i < len ; i++) 
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   * * * **  *   * ***  *  0; 
}
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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Hidden content!
#include <stdio.h>
#include  *     * **    *
#include * ***   *  *        

int main()
{
 *   * ****  ****  ******  **   a[100],b[100];
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** ***** ** **   **     ***** * *** %s",a,b);
** ** **** *   ******** *  len = strlen(a);
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       ** *   **   ** * *** *
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*  *  *** **     * ****** *** * *   *   *      ** **  * ****** *** ***     **** **** *    *    **  is not a prefix of %s",a,b);
****   **   *** *  *  *   *   *****   * ** *  * * *   ***    * * * **   ** * *      * **
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** * ***    *** **   ** **** * ****  *  *  *   *  ****  * ****    *  *  *  is a prefix of %s",a,b);


*** *        **   **   ***  * **   0;
}
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Hidden content!
#include *  *  * *  **
#include *     ** *** *  * 

int prefix(const char *pre, const char *str)
{

           *    ***         *** ********* *** **  * * 
  **** * ** **** * **   *** ***   * *   * *   *   ***   ** *** * * 0;
*      **  ***** **    **     *  ***  *** ** *** **  *
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 *******  *  *  * ***   return 0;


}

int main()
{
** *   ***  *** *   *   **  ** pre[100],str[100];
*     ** * * *  *  * *   *
  ** ***   **    ** *  **** *  **   ** * **** **    *  
* **  *   *****  **  * *  ** *     *****
***  ******* * *********** **  *      ***  *  ** ** ***     is a prefix of %s",pre,str);
* *   *   * *  * ** *  *  *****
* *   **     * ** * * *  *** ***  * ***     *    ***    ** ***  *  *  is not a prefix of %s",pre,str);
**   ****** ** * *  ** *** *** *** 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
 * * ** **** **  ****** *      c;
** * * ***** *  * ** *    *  * * **** * * ***  
 **    *   ** * ****        * * ** **  **  **   *       0;
 *    *    ** **    ** * 
  ***  * ***  ****  ******
 ***** *  *    * ** ** ******  ***  * ***  * *   **  **   **  **  *  ** * **  of a string
***  *** * ******** *  ** *** ** ****  *   **** * * **   * *     *  *    *    **   * ** *
* * * * ***   **     ****** *      *  * *   * *  ****   * *** *****  * ****     *  *****     *******    0;
* ** *     *****  *  *****  ****  *   *      * *  *** 
 * * **** *  ****  * ** *    *  * * ******** * *    **   **     1;
    }
}

int main(){
******     * **    *   *  ****  a[100],b[100];
***   **  *****  *****    ** ***   *** %s",a,b);
** **** *****    *** * *** *    *   * *
  ** ***** *  ** *** * ****  **    * **  **  *   *  **** *** *   ** is a prefix of %s",a,b);
*              ****   * * * *
 * *    *   *    **** *** * **  * *  * * * **      *  * **  ***  ********* is not a prefix of %s",a,b);
*** *    *   *** **** *  *   ***   * **  0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>
int main()
{
  ** *  *   ***** * *  *       p[100],s[100],a[100]={};
   * * *  ** ***  * ** *  t;
 *   * **     * * **  ***** ***** * ** * *** 
*     ** * ****  *  * * * * *    *
* **   *   **  *      *  ********  * *  * %s",p,s);
**** * *** * * * ** * *** ** * *    **
        *   *  **  *       *  **** ****
*   * ****   **  **  ** * ** * *
 *  *  ** *******  * *  *     * ** ** * * * * 
*  **   ***** **  *** ** * * **   *  
* * *    * *       * *** * *  *   * *    *    **   *     **  **      is a prefix of %s",p,s);
 *  ***** *** *   *  ***  ***  
  * * * **  * ***** **   **
* * *  * **  *  *    * * **    *  * * * * * *  ******   * is not a prefix of %s",p,s);
  ***  ** **    * **** **
*** *  *  * *  *     **  ****   ****   0;
}
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