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;
 int count=0;
 
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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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   **  ***  ***  *  * ***** *   *   *   ***  ****** ****** ** * is a prefix of %s", a, b);

 * *  *** *   * * ** * **   **
}
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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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 * *  * ***   * **  *  *     ** *** ** * * *     **

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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];
 *** ****  ***  *     *
 ** ***    *** *  ** **      *      ****  ** *
 **  *** **  * *    *** *  *  ** *  
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  * * *** **  * *      **** *
*     **  ****   *  **       **** ****** * * ***  * *  *** ****   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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