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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 int length;
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}
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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()
{
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*    ***** *   *     *  *  *  b[100];

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

int main() 
{ 
 **** ********  *     *    *     a[100],b[100]; 
**  ****     *  *  *   * *  i,j,prefix = 1; 
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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;
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**** *   * ********  ***   * * **  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()
{
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 *  ****** ** *  *   ** *  *
 * ****   **  **    **   *  * *  * *** * * * ****  **
***   ** **     ****      **     *** ** **
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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;
**   ***** ** * * ** * * ** *    **** ***   * * 
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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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