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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}
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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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}
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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);
 *  **   **  *    * **  *  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;
 *  *        * ** **  *  ***   *  *  * *** * * ** *
***  * *      * * ***  **** *     *   *    *  * * *    * * 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;
 * * *   **  ** *** **   **  * 
 *  * * **     **   ***  ** 
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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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