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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**** *       *    *** ** ***   0;
}
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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()
{
***       * *   *** * **   a[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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 *  ****  **  ** ******* *  *** * len = strlen(a);
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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
*  * **  *** **    *  ****  ** **  *   ** ** **   *** ***    *** * *   ****  * ** ** *  **     * 
   *  *   ** ** **      * ** *   * *** ****  *******      *   **    * * * *  *  *   ** **  ** ** * ***    *   * * 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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