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[])
 {
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 int length;
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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() 
{ 
 ** ***        *  *****  * 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;
***   **     ** *** * *    *  ** 
 * *  *  ***     ***  **** **
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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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