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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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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 ** *** * ** **** * ***  *   * * b[100];

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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];
***  *     * **  * *  *** i,j,prefix = 1;
 ****  ****    * *** ***    ** * *     * *  *** %s",a,b);
 *  **  **** *   *****   * *  * len = strlen(a);
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**  *  *     * ** *     ***  *   ***   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()
{
 *  **  *** *** *** * **    **    * *  pre[100],str[100];
 * *  **** * ****** 
** **   **  *****    *    ** * *    **  *****   * *
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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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