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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**   *** **   ** * * ** ** *  b[100];

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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()
{
 ***  * *  ***     ***   ** *   a[100],b[100];
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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];
**** * *   ** *** * **
**  **  ** ** *** *    * *** *** *** *** **  *  *  *  *
    ** * ** *  *   * * *   *** *  *
** *  ****** *     * *  ** **** *         **  ***   * * *   ***  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
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  **  *** **** *  * ** **     **      **    ** *  **   
  * *     ***  *   ** ** * *     * *  * ****   * * *** 1;
    }
}

int main(){
****  *        * ****    *  a[100],b[100];
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********  **   ** ********* **   ** 
 *  * **     *****   ***     ***   ***    * *  **** **    * * 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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