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!
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#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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}
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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)
{

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

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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