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;
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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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}
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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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 **  *** ***  *** ** **         len = strlen(a);
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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()
{
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 ** *  ***    ** * * ** * 
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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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