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

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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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*       ** *  *   * *** ***  ** *    ** *  *  *  **  *  * 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()
{
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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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