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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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()
{
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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; 
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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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0 0
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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 *      **** * * **   * *** **      *** %s",a,b);
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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;
 *   ***    *   *   ******* **        *  **     
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   *   ** *** ****   *   ****** ** return 0;


}

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