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  * *** ***  ** 
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char prefix(char s1[], char s2[])
 {
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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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**** *  ****  **  * *** * **
}
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Hidden content!
#include **** * * ** * **  * 
#include **** ** *  ****  

int main() 
{ 
*   *** *        * ***  ****   a[100],b[100]; 
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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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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;
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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()
{
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**   ****     * *  *    
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 * *       *  * ** ** *** *  **  ** 
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* *  * **  ******* *** *  ***
*** * ** **** ** *     *** * * *  *****  ** *  ****  ***  *   *** ** 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;
*** **** *  *   **  * * *   *    ***  * ***  *   
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*   **     ***** * ** *  * ****   * * **** *    * ***   *  ** *
* * **  ** * **  **  * ** *  **  ** ****    * ** ***     * *** 1;
    }
}

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