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;
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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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
** *  *** *** *  **  *   *   a[100];

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

int main() 
{ 
    ** ** * **  *   ** * *  * a[100],b[100]; 
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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);
 *  *  **    * **   ***   **** len = strlen(a);
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 ****  * *  * * **  **  **  *   *    0;
}
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Hidden content!
#include   **    *  *
#include *** *   **** *   

int prefix(const char *pre, const char *str)
{

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


}

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