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[]){
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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() 
{ 
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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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}

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;
  * *    * * *    *   ***** *  ***    **    * **   
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   **** *****    *      ** *  *  *      * * ** ***    *   
**  *** * *  ***   *** * * * *** * **  ***  ** ***** ** 1;
    }
}

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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