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

   *   * *** * * * *   * * * ** ** * *** *  ** * **
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    **  *  *    * *  *   *  ***** ****  **** **  
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* *    * *****  * ** *     * *  ** ** return 0;


}

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