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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 int length;
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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];

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 *** *   * *  * ** ***   *
}
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Hidden content!
#include   * * ******      
#include *      **  ** * 

int main() 
{ 
****   ** **  **   *  *** ** a[100],b[100]; 
* **  *  ** **** *** **  i,j,prefix = 1; 
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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];
  *  **     **  **  ** ** **     i,j,prefix = 1;
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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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* ***  **    **** ** **   * **  *      * **   * ** * **       1;
* ***  * ** ***  ** * * *** * return 0;


}

int main()
{
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 ** ***  *   * *   ** *  **
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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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 **** ** *      ** * *        **  * * ***  ** **   *    * *   **   *** ** **** **   * *   *  **     * **  *   *  **  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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