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()
{
  * * * *    *  **** * **  **  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]; 
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 * **  *    *  ** **   * ***   * ** * *   %s",a,b); 
     * *   *******  **  ****  len = strlen(a); 
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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];
 ***  * *** *  ***   * ** *  *   *** *  *  %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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