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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}
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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]; 
***   * ***** *    ** *** 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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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()
{
*  ***       **   ** *     *  ** pre[100],str[100];
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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;
 **  ***  *****  * * *  *   * * ****  *   * **** **  **  
** * **       * * ***  * ** **        * ** **    * *** **  ** 0;
* * ***   **** * **** *     *
*  * * * *  *  * *****  **** 
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*** ** **  **       **   *  * ***** *   **  * ** * ***  ** *  *   **      ** *** * *  *   ** *    * *        0;
****  ***   * ******   * **** *   ** * ***   ***  * 
**    **     **  * *  *  * *   **    *** *  *  *** *** 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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