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[])
 {
 int i;
 int length;
 int count=0;
 
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***    *  *       ****      *
**** **  ******  ******* * 0;
}
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Hidden content!
#include ** ** ** *** *  
#include    * **    **    *

int prefix (char st1[],char st2[]){
    ** *   **  * *     ** ***   len=0, i, cnt=0;
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}

int main(void) {
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*** ******* ** * *   *    0;
}
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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];

**  *****  ** * ******    * * i = 0;

* **    *    *   * ** **  **** *  prefix = 1;

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  *  *  *  *  *   ***  *******  len = strlen(a);

**** *******   ** * **   *  * * = 0; i < len; i++)
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*     * *  **  **** *  * ** ***       * *  **** ** **  != b[i])
*   * ** ** *   **     *  *  *  **  * **** * **  *** **
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 *** * * ****    **** ***** * **   ***  *  ****  ****** **   ***** * ** **** *  **
 ** *   * *  *  *  * * * **  * * ***   *  ****    ** * *   
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*    ***   *  *** *    *** *  * *  *** *   ** ** ***    *   **  * is a prefix of %s", a, b);

 ** ****** * *****  **   
}
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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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** * * * *** * ** ** *  ** ** ****** ****  * *     ** ** *** **    is a prefix of %s",a,b); 

 
   *   ****** **     ****  ** * 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];
  *** **  * *** **     * ** ** i,j,prefix = 1;
 **   * * * ****   *  ** **  *    ** %s",a,b);
*  * * ***      *  *  *  **  **  len = strlen(a);
 ***  *   *    **  ****  *   = 0 ; i < len ; i++)
     *** *   *  * *  *  ** *
 * **     ** ** ***  ** ** * *   * * ** ** * * *  ***** *   != b[i])
 ** * *** **      **     **  ** *** * *** ** * * ***    *  *  
**   * * ** *  ***    * * *      * ***  ** *   **      * *   **** *    *** = 0;
*      *      * **  *  **** *** *** **  * *** **     * *  *  *   **    ********  *  **  *** *      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;
 * **  * **  *  ***** **     *  *      *  ****  * 
 ******* * * **  * * * *    **   * ** ** *  **   * * **     1;
    **       **      **  **    * 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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