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()
{
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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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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;
   *** * * *   ***  * *  * ********    %s",a,b);
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** ** *  * * * *** *** ** **  * 0;
}
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Hidden content!
#include * *  *  **    ** 
#include  * *** * *   *  

int prefix(const char *pre, const char *str)
{

* * * *    **      **  ****   *    *  * *** * * 
 *** ***   **     *   ** * ***  *  *  *** **  *  ***  *  * 0;
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*   *     * **** *  * ** ** *       * * **  *  **   *  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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