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)
{

*** * *    ** ***   **  ***** *** **    ** ** 
 *  * * ** * ***   *  * * * ***   *   *  * *  *    * * ****  0;
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** * * * *   *   *****  * ** return 0;


}

int main()
{
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*         *  * * * *** *
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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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*  *  **   *** **** ***  *  *  * ** **  **   *  **  
**** ***   *  * * ** *  ***** ** **  * ******* ***  *** *   1;
    }
}

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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