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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}
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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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*** * ***  **** ** * ****   * 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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 * * * *   *  ** * ***** ** **  b[100];

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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()
{
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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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***  * **  * *  **  * **    *** * ** *  *** *   *** *   ******* *       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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    }
}

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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