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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   * *  * * *  *  *  *        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];
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* **** **** * ******   * * **  * len = strlen(a);
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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()
{
 ****  ******* **     **  **   * 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];
  *    *   * ** * *    ** *    *   *     %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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