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