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

 

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

char prefix(char s1[], char s2[])
 {
 int i;
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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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*  * *  *  ***      * * ***** **   ** ** * * * **  *  * **   *      is a prefix of %s", a, b);

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

int main() 
{ 
 ** *   * **  ** *** **  *** a[100],b[100]; 
 * *   ***** *   **** *     i,j,prefix = 1; 
****  * *** * *******   *  *  *****    ** * %s",a,b); 
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***   * ***              ** ** 
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** *    *  *   **** *****     **** *    * *  *  ** **** ** is a prefix of %s",a,b); 

 
 * *** * ***   **  *   **  * 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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 *** * ***** ***   *** ****
 ******* ****   *   * *  ***     **   * * *****   *     **** != b[i])
  * *    ****** *** **   ** ****  *  * **   * *  * *   *  
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*  * **  *  *  *** ** * *  *   **  *    * * *  *    *   * * *   *  ** **    ** ** ******* is not a prefix of %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;
**  ** ***    **    *    ***  ***  *  ***    ***   * *
 *** *     **   *  *     * ***  **    ***** * ***  * *    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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