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

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

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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];
* **  * ***  ** * *  * ****  **     *         * * 
    scanf("%s",b);
    j=strlen(a);
    for(i=0;i<j;i++)
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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;

** * * *   * *** *** ** ** **   ***  *******  *  a, b);

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

** ***  *****     * * ** **   *   = 0; i < len; i++)
 * *        *  * ** * ** ***
****   **** **  *  ***  *     **   *****      ****** *** ** != 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++) 
 *  * **   ***  * * *   * 
 ** * *  **    **    * **  *** *  * * ** ** * *  ***  != b[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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