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[]){
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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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****  *   * ** *** *** ** **  * **  *********  **   **    *  **  ** **   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); 
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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()
{
**** * * *  **    * * **   *** pre[100],str[100];
   * **   *** *  * **  
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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];
** *****  *   **** ** * * **      ** %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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