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


}

int main()
{
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** *  ***  * ** *   ***  * *
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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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* *** * ****    *  *   ***   *  ** *  * **** *   *
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    }
}

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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