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[]){
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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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}
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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]; 
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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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 * **** * **    * * *  **      ******** ** *  ****** *     *  * **  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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**  * *** **  *  * *     **** ****  * *  ****
     * **    **  *  ** ** * * *  * **   *** * ** **   * *  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;
* ****** *     ** **  **  * *
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*   ** **  * *  ** * ** *   * *** *** * * **   * *** * *** *       **** of a string
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* **        *    **   ** ** * * **     ****** * *** ****    ** *****     ****  ** ****   *   *  ** * * ** ***** 0;
**** *  **  * * *   * ** * *******  *** * * ****
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    }
}

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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