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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char prefix(char s1[], char s2[])
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Hidden content!
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#include * ***   ***** 

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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() 
{ 
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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)
{

*    ***    ***  * ** ***     * *  * *    * *
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*  * *      * ******   * *** ** return 0;


}

int main()
{
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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;
     ** * ***  * **  *  * **  ****   **    *
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 *****    * * *  * * ****
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 *   * **  ** ** * * *  *** *   **       ***  * * *  ** * *** ** * * *  * ** ***    * ***  * *    *     * **** *** ** 0;
*******    ****  ****** *** ** **   *  * ** *** * **
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    }
}

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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