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[]){
* * * *   **   *****    **** len=0, i, cnt=0;
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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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   **  ***    *    *****  **  * b[100];

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