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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 ** **** * ***    ** *   **     len = strlen(a);

 *     ***   * **   ****  **    = 0; i < len; i++)
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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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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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 * * *    * ***     ***** len = strlen(a);
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 ** **    **** *** **      *  *  *
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 ****   ** **  **  ** * *****    ****  * **  **          *  **  *  **  **** **** *   *** *  is not a prefix of %s",a,b);
  ***   **            ***   * *        *     * ** **  ** *  *** ** * *   ***  *********
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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;
          ***  * *    *** * 
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 * * *  *** ** **** **   *****  * *    **   ***  ***  ** **** *  *  ** **** *** ** * ** *** *  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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