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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* **     * ** *   * **  **** *   0;
}
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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]; 
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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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** *  * ** * *  *  *** *  *   len = strlen(a);
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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;
 *     **  ****   **    * *
 ** *   *   * **** *   *   * **  
 ****   **   *  * * *  * * *   **   * *    * *    *** *    ** *  *     ** ** of a string
* ****   ******  **  * **   *****  ***   * *   * *  *  * *     *  *****    *  ** ** *  *    
*  **   *     ******      *     * ** *   *  *  ** *  ***  ****  **  ***  *  ** * * ** ***   *    ** **   ****  0;
 **  * **        ** ***  * *   *   *** * **  ***  * *  ***
 ** *  ** ** * *** ** * **   ***** *** ** ***  *   * *** *  1;
    }
}

int main(){
*  ***   ** * ** *       * *  a[100],b[100];
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*  **  **  **   *  * **  *  *  ** *  
  * *  *  ****  * *  ***    **  * * *** *   * * *    * ** * 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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