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[]){
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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];

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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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* **   * *  *   *** * * ** ***   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);
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** *     ** * * *** *  * *****       **       *  * ** 
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**  ********   **** * * *    **  ****** *   ***  * *****  *****   *   ***     ** ** **  *   *** ** *** is not a prefix of %s",a,b);
***** * **** *  * ***   * **  *** ** *  **  * ** *** *   *   ** *    * * ** *  * 
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*    *   * **   ** *   * *  **** *   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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