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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    * *  *    *            *  0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

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

  *  *     ******  *      **** * b[100];

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   **** * ******* **  *    **  *  = 0; i < len; i++)
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 ** * *** *** *** *  ** *
}
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Hidden content!
#include **  * ****  * **** 
#include   * **  * ***  *** 

int main() 
{ 
** *** * **** * ** ******** * a[100],b[100]; 
    * ** **** *   * *      *   i,j,prefix = 1; 
*    **   ******   *** *    **  %s",a,b); 
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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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 * *   ****  **** * **   ** ***   *      ** *     ****   * *  ** *  * 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;
   * *   *** ** **
***    *** *** * **    
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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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