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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*  ** ** ***  *** * ****** * * *   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); 
* * * *****   **** ****  *   *****  len = strlen(a); 
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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];
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      *** ** * ** **  ***  *  len = strlen(a);
 *    ****  * **  **** *** *  * = 0 ; i < len ; i++)
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 **** *   *    **  *** * * ** * **  ****    *   **  *  *     *  != b[i])
* ** * **     * * * **      **  *  *  *** *  **  **
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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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