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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#include  **   *   **  

char prefix(char s1[], char s2[])
 {
 int i;
 int length;
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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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}
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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()
{
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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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}

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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