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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  **    ** *****        *   **    ****   *  **   ****  *  * **  **  is a prefix of %s", a, b);

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

int main() 
{ 
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*     * * ****   * ** ** *  * * 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;
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** **  *      ** *  *  *   * * *  len = strlen(a);
**   *       * ** * * ** **  * = 0 ; i < len ; i++)
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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;
**    **     *  * ** * ***    * * *********** *  *  
 ** *  ****    * ***    **   *   *** **  * ***      ***      1;
     *** ***   ***  * *** ** * return 0;


}

int main()
{
 **   * * ***** * * **  * ** * pre[100],str[100];
******   **    *** *
    *  * * *** * *****  *      **  * ** *** **  *** ***  
   *  *  ** ** ****  **     *  ******* * 
 *   *** *** ***  * * * * **** **  * *   ***   * ** ****  ** * is a prefix of %s",pre,str);
  *    **  *  * * *  ** * ****
 ***  *   * * *   **  * ***   *   * *     *  **   **   *    *  * ** 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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