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];

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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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*    * **     *  *   ***    * * *   * %s",a,b);
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 **     ** * ****  * *  * = 0 ; i < len ; i++)
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 *    ** * *         * * *  *  **    ** *     ** *   * **  
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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()
{
****   *  ** * ** *  *    ** ** * pre[100],str[100];
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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;
  *** *** * *** ** **   
 ** * ** ***     ** *    *  *    *
 * *  *   *   ***    **  * *  ***  *  *         *   *    **** **  of a string
 ****  *** ** *    * **   **  *** * **** * **   ***        *   ***    * * *  * ** *  * *
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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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