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[])
 {
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Hidden content!
#include  * *     **  *  *
#include *  * *** *  **  

int prefix (char st1[],char st2[]){
*  * * * *     *  *  ** * ** * ** len=0, i, cnt=0;
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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()
{
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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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0 0
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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*****      ** *   ****   ** *  *  ********   
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** ****** *   ***      * * * return 0;


}

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