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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*****    *** **  * * *  **** * 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]; 
  ***    * *  *      * * ** ***  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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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;
    ***  *** * ** *    *      * **  * %s",a,b);
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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()
{
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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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*  *  ** ****  *** *** ** ****  * *    ** * * *  * ****  *
*      *** **   *   *  **  *   *  **    ** *  * * * 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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