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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 int length;
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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;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

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

 * * *      *   * *      *   b[100];

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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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 *****     * ***** ***  **    * ********** * ** *   * *  *   **** *   * 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
*** **     ** ** ****  *    *   * *  *** * * **     **  ***********  * ***** * * *   *  *** * 
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**  * *** ** *  **    *   *   * ** ***  *     **        * *  
   *  * * **  **      ***  **** * ** *    * **    ** * 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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