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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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()
{
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   *  *  ** *  ** ** * *** *      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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     ***   * * * **  *   *  *  ** 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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**   **** ***   **** * *    ***  * *   **  **    **   **   *  *   *  *   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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