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[])
 {
 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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  **   * * *** ***** **** **     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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   * * ***    *** ***** ***  * 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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* ** ***  ****     * * * **  ***    * *  *** ** *    ** *    **** 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()
{
* *  *   ** ** * ****   *  ** pre[100],str[100];
 *********** * **** **
 ******* **  ****** *   *** ****  ** ******   *   *** 
* *** ***** * ***** ***   * ****  **  * 
  *    * * *  *     *       **  *   *  ** **    *  *  *  *  *    **  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
****   * *****      * *    ****  * ***** *  * ** ****** **  *   *  **  *  ***  ** *****  ** *
***   * ** *  *  *   **  *  ** ** ** ****  **     * *   * * *****    *** * ** ****  * *    ***   *** *   ** * **    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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