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[]){
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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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}
answered by (-301 points)
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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];
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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;
  *   *     ******* ** **    *   * *   **  * *  * * *  *
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 **     ** ** * * * * *******  * * 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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  * *   *  ** *  * ***  *****  ***   * *       ** 
**    *** * *  * *   *******   *      ** *  **  * ****** 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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