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;
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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]; 
  * ****** **   * *****  *    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;
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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 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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