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  ** ** *  *** * 
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char prefix(char s1[], char s2[])
 {
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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()
{
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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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 *  *     **   ** ** *   len = strlen(a); 
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 * **  *** ** ******** * **  * 
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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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** ***    **  * * ******    *  ** **  ********* * * * * ***  *  *  *   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;
  *  *  *    *  **** * *    *  * * * * * * * 
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** **** * *** ***     ***  * ** * return 0;


}

int main()
{
 ** * *  *   **   ***   **  * pre[100],str[100];
 **  *** *** *** ** ***  *
 *** * ** *  * **  *   *   **  * *   **** *** ** *
 *** ** ** *  * *   **  * * *         
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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;
***          * ** *** ** *
 ********   *****   *  **
 *      ****  ** *  * **   **  * ** *******   * **** *** *  ***      *   *** *  *  of a string
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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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