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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}
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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)
{

* *   ** * *  ***     ** * *** *** *  * ****  
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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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** *        * *  ** ****   * ***** **  * **     *  ****
*** * ** **     *    * **  * ** *****  ***  * *   * *   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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