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 * *  *   *  ***     

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 {
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Hidden content!
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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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}

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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 *** **  ****  *  * * ** ***** **   *  *** ** ** **  * 
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    }
}

int main(){
**  *       *  **  *** **   *   a[100],b[100];
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 *** *  *  ** *  *  * *      *    *  * 
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 ****  * **  *  * ** * ** *** 
* ****  *** * ** ****      ***** ****    **   *  * * *    *** * * * *  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);
   *  ** ** * ****** * * **  *  *       
***    ***  **   * *  *  *  *   ** *  *
*  * **  ** * ***** *  **  *** ***  
   **      * ** *** ****  ** **  ** * *****  ****
 * **     ***   * *  *      * ** * ** ** *
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  *   ** *   *  *  *  **  
* * *** *    * *     ** * ***  *   
**** * * * *** *      ** * **   * ****  ** ** * **** * *   * * is not a prefix of %s",p,s);
***  ***  * ** * * * ******* 
 * ** **  *   *     ** *   * * * * 0;
}
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