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() 
{ 
* ***  * *    **   *   *** a[100],b[100]; 
** **  *** ** **  **  **  * i,j,prefix = 1; 
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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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*******     ***  * **      ** ****   *** **   ** ***
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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;
 ** * * ****** *** ***  * * * *  *   * ***      
*****  *     * ** *******  *  *****     *       **  * * 0;
**** * ** ***  ** * ** *
* *     ****  *** ***  * **   *
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* * **     ** *   **  * *****          **  *  **  * *   *  
 **  *  **  *      * *  ** * **  ***  * **          * 1;
    }
}

int main(){
 ** *  * *  *    **   *** * *    a[100],b[100];
***  ***  **   **     * * *    * * ** %s",a,b);
********** **   * *  ** * *** *  **    **
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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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