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;
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}
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Hidden content!
#include **       * ****
#include * ** * ** * 

int prefix (char st1[],char st2[]){
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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;
}
answered by (-281 points)
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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**** *   * * *   **     *** b[100];

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  ***   ***  * *   ***    ** 
}
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Hidden content!
#include  ******* ** 
#include   * ***** * * ** 

int main() 
{ 
* *  * *  * ** *******  a[100],b[100]; 
* * *** * *** ***  *   *****  i,j,prefix = 1; 
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* *  *  *   *    ** *   *  *  len = strlen(a); 
    * *   **       *      * **   = 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);
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**  **  ***    **      ** **  * * ***  *  *  * *  * *
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   *****  ***  ** **  *** **  ** * * ** * *       **** *  ***  ********* *** *  ****** *  is not a prefix of %s",a,b);
*** ** * **   * ** ** *  *  ****  * * *  ****   * * ****** *     * *   * *  
 *  *  ****  **     **** *  *****  * *     * *   *

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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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