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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}
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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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 * ****    * * * ****** ** ** *   b[100];

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

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

** *  **  *   ** **  *  ****  *   *  **  ******  * * *
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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;
  ** *****  **   ***   *** ** *** * ****  * *
 * **  * *  ** ***** * *  * * * *    *        **** * * 0;
 *  *   ***   ***  **  ***   
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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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