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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}
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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()
{
 *   *  ** **  *  *** * *   * * a[100];

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

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****  *    ***   ****      len = strlen(a);

**  * * ** *** **  ***   *  = 0; i < len; i++)
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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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*****   * *** ***    *   ******* **  * ** **  * ** *    **** **  ** * is a prefix of %s",a,b);


* ** * ** *   ***  *  ** ****   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 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;
    **  ** *  *  ***  * *   * *** *   ****  *** *  
  * * **   **     * ***  * ** *** ***   **********     0;
*  ** ******* *   ***     *
****  *  *  ***   ** *****  
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***** **   **      * ***  * **** *      ** ** *   * * *   * **   * ** * *   *   *  ** ***  **  * 
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*** ** * * *  * **** * *  * * *** **  *** ** * **     ***
  *  **  *   *     * ** *  ** * ***      **       **  ***     1;
    }
}

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