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[])
 {
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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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*   **  **   * *   ****  *
}
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Hidden content!
#include *** **  *   *  *   * 
#include ** ***    **   * 

int main() 
{ 
*** **** **** **** * ******      a[100],b[100]; 
*** ****** * **** **  *      *    * i,j,prefix = 1; 
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}
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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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 ***  ** * *** *** * **  * *  0;
}
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Hidden content!
#include   ***   *   *
#include *  ** *** * * 

int prefix(const char *pre, const char *str)
{

   * *****  **  * *   * **   ****    ***   * *   * *** *
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* * ** ***   * *  *  **   **     *** * **  *   ***
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  *  *  ** *** *    * ***  * * *  return 0;


}

int main()
{
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* * **     ***  *   **   
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**** **   * * **      *** ** *  * * ***
*     * *   * * ****   ******  * *  ****  ** * **** **   **  ** *  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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