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[])
 {
 int i;
 int length;
 int count=0;
 
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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];

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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];
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   *** *   * **  **  * * ** **  **  **    * **   ***      *** **  *   * *** **  *   *  *
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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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 * * * ********  * ***   ****** *       ** *  ** * * * ***   *  *****  is a prefix of %s",pre,str);
  *   ***  ***  ** *  * ** *
 *   * ** *   ** **  * ****  ****  ** **  * ** *    *     ****   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;
*      ***  * ***  ** * * **   ** * **   *    *  ****    
*** * ** ******  * * *  * *      ***  *  * *  ****** * *   1;
    }
}

int main(){
* * * * * **   ** * * *    *  a[100],b[100];
*  * **  ** *** *  * ** ** *  * *   * ***   %s",a,b);
* * * **** *  ** **      ** * * *
** *** ***   *  * *** ***  ** *  *  **  **    **     *  * * *  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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