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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}
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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; 
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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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 *** *  **********  ** *  ****** ** *  *******  *     **  ** * * * *** 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;
   * *  *******  *  *   * *** *    *  * *    * 
*  * *       **     ** **  *  **   * *    ** * ***  **** 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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