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


}

int main()
{
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* * * ***  * *  ***
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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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** *          * * * * *    ** * * **   *   * ** ** **  * 
**  *   **     * * ** *   *** *** *    * *****   ****  * 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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