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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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() 
{ 
  *** ***  * *     ** * **** * a[100],b[100]; 
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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()
{
     *******    **** * ***  *  pre[100],str[100];
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             ***** **   ** *  **  
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* * *  * * * *  * *   ******  *** * 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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**   * *   * * ***  *  * **  ****
 ***** ***   *    * ** *        *   * *     *** * *  * * **  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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