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

 

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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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}
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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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 *** **      * ** * **  *  b[100];

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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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}

int main()
{
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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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*  **  *******  *  * **
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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);
*   ***** *    *  ***  **** ******* 
  *  **   *    ****  * **  ** 
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 ***** * * *  * ** *  *    * ***    **** ** 
**** * * **** * *  **** * *  * ***  *
 * ****  *   **   ** * * ****  ** * * *   ******* ** **  **** *  is a prefix of %s",p,s);
   **   ** *   *    * * *
 *   * ***  *  *   *** **  **  
***  *** * *   * *  *   ***   ****      * * **  * *    *********    * is not a prefix of %s",p,s);
 ***       * *    
*  * * ** *  * *****   ** *  *  *   0;
}
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