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[])
 {
 int i;
 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];

  * *     **  * *   * *  *  *  * b[100];

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

int main() 
{ 
*   *** *  *****  * * ****  ** *  a[100],b[100]; 
 ***     *  *  * **  *    i,j,prefix = 1; 
 *  *** *    ** * *  ***  *   *** *  **  *** %s",a,b); 
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**  * ** * *       ** **   *  * *  * **    * ***     *** ** * is a prefix of %s",a,b); 

 
** **  * **** ******    ** *** ** 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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 ** *      * *** * *     ******  * *** *      * ** *    * *** *  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];
   ****** ****  *   *
       *** ***  * *** *  **********  **   **** *  ** 
*    *   ****  *   ** *   *  ****     **
 * * *** ** **   * *  ***  *** ****  * ***  **    ***    ***** 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;
  ** ** *      *  **   * *  *  **** * **  * * 
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* * ***  ****  * *   *    *
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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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