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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}
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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;
}
answered by (-281 points)
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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; 
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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);
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 * * ** ** ******      *  * **    = 0 ; i < len ; i++)
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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;
 * ** **  *****   * *     **  ** * **   * * *    * *
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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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