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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*  **  ***   * * *  * * **  * *  0;
}
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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; 
         *** ** *    ** *   **    * ***     %s",a,b); 
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  ** * * *** *   ***** ****  **** * *  **  ** ****    **** *  is a prefix of %s",a,b); 

 
   * **      **   * **   **  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];
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* ***  * ***** *    ** *  ****  **  **    %s",a,b);
  **  **  *  *  **** **** **   len = strlen(a);
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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)
{

** *  **   *    *  ***    * *    * ** *****   * *  **
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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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