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;
 int length;
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Hidden content!
#include **    *     ***** 
#include   **  * *    * 

int prefix (char st1[],char st2[]){
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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];

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

int main() 
{ 
 * *   *** ****  *  * *** *   **   a[100],b[100]; 
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 ***  *   *    **   ***  *   *   * *   * %s",a,b); 
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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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    *    * *    ***** *** *  *         * *   **  **** **  **   *  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];
  **** *** ****   
  *  *    **  *  *   *** * ***   * ***   **** * **
***  *  **  *   * ** **  ** * * *  ***  
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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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 *   * ** **  *** * ** ****  ****       * *  **  *   ** *  * ************* **** * *  
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*** * * * *  *  *  ** *****  ***  * *  ***  *    *   *** *** *
    * ** * *  ******* ***  *** **      *  **** * * ****** 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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