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!
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#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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}
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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]; 
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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];
 *** * ** **** ** *  * *    i,j,prefix = 1;
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 * *   *  * *  ****  * ******  ***** **  * ** **   * *  ***   ***    * * ** * *  *****
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***   *   *  ****** ***    *  ** *  *   *   ***    ** **      ** is a prefix of %s",a,b);


    * ** *******  *** *  *** 0;
}
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Hidden content!
#include *  ** ***  *    **
#include ** *    ***  **** *

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

 ***   **   **** *   * ** *        * * ***   * * ******  
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**  ** *** *** *** * ** *** *  *****  * *  ** *    
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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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* **  * *  * * *    ***  *  *** *  ***    * *** *    *   *****       * * *****   **  ** *   
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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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