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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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()
{
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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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* ***     *   *** *  * **  * **** **   %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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 **   *   *      *      *  *  * *  len = strlen(a);
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*  **   ** * *    *** * *  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()
{
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 * *** * *     ****    **** *  *  
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 *   *** *   * * *****   **** 
**   ******  *** **** *    *****  * *  *  *   *    ** *  ****    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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*  *  *  * **** **   ****   *   **  ****       *   ** 
 *  **  * *  *  **** ***      *** * *** *** ** ** * ** * 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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