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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 int length;
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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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 ***        **     ****  *   ****     *  * *  %s",a,b); 
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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()
{
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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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       *** ****  **  *  * *** ***  **  *  *   
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  *      *** *    * *     return 0;


}

int main()
{
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 *  * *** *** * *** *     * *** ** *****
 *  * *      * * ***  ** *   **  ***    ***** **   *  ***  ***   *   *  is a prefix of %s",pre,str);
*****  *   * ** * ****     
     *   *** *  * *    **   *     ** ** ****  ** ** ******   **  ***  *** 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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***    **      ** **  *   ***   ****** ** **     ** ****
 **  *  **  *    *  ****   *** *    **     **           **  1;
    }
}

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