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;
 int count=0;
 
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}
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Hidden content!
#include *  * *** ****  *
#include   *         ** **

int prefix (char st1[],char st2[]){
 **     **   *   ****   *  len=0, i, cnt=0;
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 *  ** **    *  ***    ****** *  * 0;
}
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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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   * **** **** *     **  *  ***  *****  * * ***   *** ** *  * *   is a prefix of %s", a, b);

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

int main() 
{ 
 * **     *  *        * **     *  * a[100],b[100]; 
  *** ****  **     **   *** ** i,j,prefix = 1; 
** * * * *   *   *  *** * * * *  * * %s",a,b); 
* ** * **   ** *  *  *  *  len = strlen(a); 
 *  ** ** ****    ** **       = 0 ; i < len ; i++) 
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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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 * *  * * *  *  ****  *   
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****** ***** *     *   *  ** ***     ** ***   ****
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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)
{

   * **  *  *     ** ***  *  * **** *  **  *  *
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   *    **  *    ***    *   ** ** **    ****
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  *  ** *******         * return 0;


}

int main()
{
** *    **  ** *    *****    pre[100],str[100];
 * * *  **       * * 
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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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 ** **  *****  ***  ** ******   ***   * *** ** *     * *  ****  ** **** ** **** * **   * ** *       **
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*   *    *    *** *** ***    ** * *    * ** *   ** *****  *
******   ** *   * ** ****  *  *   * * *       * *** *  1;
    }
}

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