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;
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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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****    **** *   ***  *  *        0;
}
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Hidden content!
#include  **  ****** ****
#include *  *   **   *    

int prefix(const char *pre, const char *str)
{

   ** *** ** ** ***   **   *  * * **  *         
   *   ** **  ** **  *   ** **** **     * *  ***  * ***** * 0;
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}

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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    }
}

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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