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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}
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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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   * ****  *    ***   ** * ***** ***    * *    ******* * * * *** 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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    *  *   * * *** ** * * 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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 *   *   * *****  **** * *** *** *    * *  %s",a,b);
 * *  * *  ** ***  *  ** ****    len = strlen(a);
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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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