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!
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#include ** *     *   ****

char prefix(char s1[], char s2[])
 {
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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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}
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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]; 
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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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* *** **  *  **  *  * ** *** *   0;
}
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Hidden content!
#include   ** ** **  **  *
#include *  * **  ***  ** *

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

  *** * ** * ** ******   **** * ** * ****  *   
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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;
  ** * **** * *   *  * *** * * *   **  **   *    * 
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 ** **** * ****    ** *   *
 *  * **   ****   * *** **** *    
 ** * **** ** * ** *   ***  * * ** *** *   *  ** * ***    ****  *  * * * *  * *  of a string
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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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