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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* *  * ** * ****  * ** *   ** **** 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]; 
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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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 *  *   ** * * * **  ** * len = strlen(a);
 *  *  **  ** * ****  * **   **   *  = 0 ; i < len ; i++)
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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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 *     * *  ** * ********    *  *  ** * ** * ** *  * *** * **** **** *     * *  * * * * ** ** * *    **   *   * *     * 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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