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