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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#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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   ****   ***    **      *  *** 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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}
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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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   * ***  **** *   * *        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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 **  *  *  *  * *    **
 *** * ***  *  ** *    * **  *   * * **  * **    *****   
 * **  *    * * * * **   * **  ** ***
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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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 * *** ** *** **   *** **   * ** **  *****   ** ***  
 * ** * **  **  *  *****  * ** * **   *  *  **** **** **  1;
    }
}

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