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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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() 
{ 
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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)
{

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

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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