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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}
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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()
{
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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];
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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()
{
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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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