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