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()
{
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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; 
*  * ***   ** ****  *** *  **   * ** * %s",a,b); 
**  *  ***   *  *******   *** len = strlen(a); 
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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);
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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;
  **      * *** **      *** *
**** ****    **   * **    * *
 *  * * **  *    * *  ** ** **  *  * ***  ***  ** ***   ** ** * *   * ** *   * **  ** *  of a string
   **     **  *** **** ** ** **       ****    ***    ***   * *** **** ** ****   **   *  ** 
* ****  ** ****  *  * * **        *  ****** * **   * **      * ***** **    ** * *  ** *  *  *  **** *   *     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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