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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}
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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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*  ******  *** *  ** *   * 
}
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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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0 0
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];
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  * *  ** **** * *   **   *** *  * %s",a,b);
* * *   *  * ** *** ***   *****  len = strlen(a);
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  **   ** * *****    * ***  *  **** **      ** * ** *** 
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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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