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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    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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*   * *** * *  ** *     * **  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); 
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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;
    *   ****  *    *** **  ** * ** * * *    **   *
****  **   * **  * **** **       ***  ***      **  ** *    *** 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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