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

int prefix (char st1[],char st2[]){
     ** *  *** ** ****       len=0, i, cnt=0;
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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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    j=strlen(a);
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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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*  ** ***        ******* *** prefix = 1;

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

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

**  **        **        ** ** = 0; i < len; i++)
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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++)
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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;
   *** ****** ** *  *  **    **   * * **** ** * 
  ***  * *** *   * ***     *****    *  ** **** ***** *  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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