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 * *        ***
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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include  *  * *  *  ***  *
#include    **    * ** 

int prefix (char st1[],char st2[]){
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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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** **    * * *     ****  **
}
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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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* **  **     *        ** * ** 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;
       *    *  *   *** **  **  * **       * * **  * 
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 **  *   ****   * * ** * ****
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 *** ** * * ** * **    *** * *****  *** *    *  **     **  * * ** ****  **  *  * * of a string
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  *******    ** * *  ** **   ***   *   * **  * ****  ** *** *
** * * ** *    ***  * *   *  *   **       ** * ******  * 1;
    }
}

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