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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}
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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()
{
*     * ***** * * *** *  ***  *   a[100];

***   * * **      ** * *    * * 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];
*  *   * * ** *  ****** * 
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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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 * *     **  * **  **  *** *    **   * **** ***    ***    *
*** *        *    * ***  ****** **** *  ****** * * 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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