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

int main() 
{ 
 *  **  * * * * **  * ** * * a[100],b[100]; 
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*  * * ****       **           * = 0 ; i < len ; i++) 
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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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      * * *  * ****  * *      **  len = strlen(a);
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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)
{

 ***  ****  * * ** ***  ***  * **** *****  * ** *  * * * *  
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 **** ** * *      ****   ** * ******  ****** ***  ** 1;
**  *    * **** **      *  * * return 0;


}

int main()
{
* *** * *  * **** * ** **** ***  pre[100],str[100];
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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;
    *  *  ****   *   *  ** *** *  ** **   * *
  *  * **  ***   ****     * * * *    ** * *** ***   **  0;
 * * **        * * ** * ***** 
 **********   *     *    ***
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* *******    *  * **   * *  * ********* ** **** ** ***  * *  ** *** ** **   *  **
*   * *      **   ** * **  **       ***   **    * *****  *********    **** * *** *  **** ***  **  *    **  *  *  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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