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!
#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)
{

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