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[]){
   ***   *** * *       * *     *    len=0, i, cnt=0;
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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); 
* * *****    ***  ** ** *  len = strlen(a); 
 *  **  * **  ***   *   **  = 0 ; i < len ; i++) 
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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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*   *** * * **  ***   * *          **   ** **  ***   *
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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;
    ***  *  **** *  ***  ** *   **  *    * *** 
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*** *   *** ** *  *   **  * **   return 0;


}

int main()
{
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    **   * ***  **** 
 * *  *** ** ** * *   **   *     ***** **  **  ***
*  * * ***** ** ** * ** ** * * *** * *  * 
* * *******  ****  *** *   *  *  *** * *    **   ***       * ** *  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
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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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