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() 
{ 
*     ****** *   ****** *  **    a[100],b[100]; 
***  * * ***  *      * ** *  i,j,prefix = 1; 
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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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*   **      **  * **    *  ** *  * 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 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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* **  **   ** *   **   *** ***   * **   ********** * 1;
    }
}

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