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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}
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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()
{
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*****  * **** * ** **  ** ** b[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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0 0
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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    **  *** *** ** **    *  ** * * ** **** ***  ** * ***** ***  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];
  * *  **** ****** * *
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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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