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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}
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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]; 
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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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