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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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]; 
*  ***  * **** ** * * * 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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}

int main()
{
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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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  ****   **        * **         * *       *** *  * ** ******  * *  *** *    of a string
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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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