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