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() 
{ 
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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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 ***  * ******  *  *   *  *  **  len = strlen(a);
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  * *** *** * ** * ** **  ***   * 0;
}
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Hidden content!
#include **  ***  ** * *  
#include  *  **  *** * *

int prefix(const char *pre, const char *str)
{

* **** ***** * * * ***   *  * **  *      ** *    ** *    
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* ****   **  ****** *    ** * ** return 0;


}

int main()
{
*   *** ** ** * *  * * * * pre[100],str[100];
    **     * ** * * ** 
  ***    **  ****      *   *  * *   *     *    ** 
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 * ****  ***   *     *   *  ** *    **   *  *    **  *  *   ** ** ** *** 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;
* ** *  ******* *** * ****** * 
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 * * ****** * *  *     * * ****   * *  *  **  * ***  **   **    * **   **    ** of a string
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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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