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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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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** * ** * ****  ** * * **  **  **  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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** * *** ***    * * **   **  * *  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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 * ***** ****     *  ****
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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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