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[])
 {
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 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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   ******** ****** ***  ******  * **** ** *    ***   *  * * ** 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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       **    *  ******* ***   *  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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*  ** **      ** ** * * 
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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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