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

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);
   *   *  ******    * ****  * 
 *   *** ** **  * *   **** * ****  
***** *   *  *  * *** *  *   *** * * *** *
  **    ***** *  **  * **   * *   *  *   *
 *  *   **   *  * ****** *  *  ** 
*    ***  **** * **  *   * * ** *  *  *   ****** ** **     *  is a prefix of %s",p,s);
**** **     **     * *     
*      ** **  *** *  *      *
 *  ** **  ***** * *** *     ** ***    *   * **   *  ** **** ****** * **  is not a prefix of %s",p,s);
* *** ** ******* ** ******   *  
**   ** * * ****  * ***   ** ***  * 0;
}
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