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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 **  **   *   **  ***  *     * ** * 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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}
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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)
{

*  *     *** *  * *  **** *   **   **** * ** *
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*** ****    **   *   * * ***  *  *  **  *    * *       
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}

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;
* *****  ****     *  *  *  * * ** *  * * **** *  *
* ** *  * * *   *** ** * *** *  ** *** **      * *  *** * 0;
  **    * ****  ***  * *    *
   *   *  * ** *** *  *****  *
*  ****  * ***  ***   ****   *****  ******* ***** **** *    * *    * * *  ** ****  of a string
*** **  * * * ** ** *   *  ****   ***  ** * *** * **** **     *  **** *  ****** **    *
 ** *  ***   * ****  *  ** *  **   * ** * **  *  ** ****** *     **** *** ** * ********  *  *  ***    * 0;
*   ** ** **   **      **   * *****  *  **** * **   *
 *  ****  *** ***** * **     **  *  *  *   * * ****  *  ***  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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