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[])
 {
 int i;
 int length;
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}
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Hidden content!
#include  *   *** ***    
#include *****   **** **  **

int prefix (char st1[],char st2[]){
 ** * **  * * *******  * *  len=0, i, cnt=0;
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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()
{
** * * ***  *  **     *   a[100];

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

******  * ** *       * *   * ** i = 0;

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 *** * *  ***   * *****
}
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Hidden content!
#include  * **  * **    
#include *  ****  *****  *  * 

int main() 
{ 
 * *  ** ** *  * *   * *   * *  a[100],b[100]; 
 *** ****    **   ****** *   * ***  i,j,prefix = 1; 
 * * * ****    *  ***** *  * **  * %s",a,b); 
  *   * ** ******    **** * len = strlen(a); 
 *  * ********        ** ** *    *   = 0 ; i < len ; i++) 
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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);
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*  *** ********  **   ** ** **** **  ***  * *** **   
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  * * *   * * * ***    *****  * ** ***  *** *  *   * **

* * * ***  *    *   *** * *  
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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;
**  ***** *  *  **    **** * **** * * **    ******  * * 
     ******* * ****  *** *****    * ****** *   ** **   * **** * 1;
* ** *****  *   * ****** *** return 0;


}

int main()
{
***  * * ***   *    *    *  pre[100],str[100];
    ** ** * *  *   * 
* *    *** *  *** *    *  *  * ***** *  **  *   
 * *     *    *** *  * **** **  * 
 ** **  * * *  *   *   * **  *      *    **  *   **** ****** *  *    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;
 * ****   ******* ** *  ***  * 
** *** * *  ***  ***   *    ** 
 *   * ***   ******   *** *    ***  ***    **** ** ***   *** ***   ** * ** *   of a string
 ****  * *     * *    * ***  ** *   *  ** **   *   ***   *  * **  *     *  * ****** *  * **
  * *** * *   *** * * *** ******  * * * ***   * *** *   **** **** ** **  **   *******      ******      * ** *  **  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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