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[])
 {
 int i;
 int length;
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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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  ** * * **** ** ***  ***   **   
    *  **     *   ****  *   *   * *  * ***  * **  * *  *** * **   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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    }
}

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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