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   ** *  **  * 

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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];
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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;
   **** ******   *  ** * **  **** ***  * *****
 *  *** ****    ******** **    **** *** ***  * **     *  0;
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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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