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!
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Hidden content!
#include   *  ***** *  *   
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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()
{
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*   ******** *     *   b[100];

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

int main() 
{ 
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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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0 0
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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*  * * * *** ** *    ** **    * ***  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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*   ***   * * ***  ***   * 
****  **   *****       **** * * *     * **** ** ** ******    *  **** 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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 **  * * ****    * *  * *  * ***     ** ** *  *  *    *  * * *
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    }
}

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