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[])
 {
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 int length;
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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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}
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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]; 
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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];
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  *  * ***       ** *   ** *    ** * 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()
{
    *  ** *  **  ***    **  **  * pre[100],str[100];
 *** ****   ****** * *  *
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   *     * ** * ** * *    * *   * ** * **
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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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 *    *** * *     **** * * *** *** ** * *    *   **   **
* * **       **  **  * *     * * **    *** * *   ***   ** *    * ** 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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