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;
 int count=0;
 
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}
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Hidden content!
#include * * *****  *  **  
#include *    ****** **   *

int prefix (char st1[],char st2[]){
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 **      * * *** ***  *    * * *** 0;
}
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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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* ** ***  *    * * *    **  *   0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
****  ***  *    * * ***   a[100];

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

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   * * * *  **  ** ** * * ** ***  * *   * ****    * *** ***   * is a prefix of %s", a, b);

    * ** ** * **   ** ***** * * 
}
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#include  **  **  * * *   
#include ***    ** **  

int main() 
{ 
  ****  * *  ***       ***    ***   a[100],b[100]; 
*  *    ***   *  **** * i,j,prefix = 1; 
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      *  *     *  **   ** **   len = strlen(a); 
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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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 * * ** *   * *** ******      * * ** * **  ****  **  * * *    *  ***   is a prefix of %s",a,b);


*  *******  **** * *    *  *  * 0;
}
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Hidden content!
#include **   ** * **  * 
#include **** ** *       **  

int prefix(const char *pre, const char *str)
{

* *     **** *** *  * ***  ****** **  ** *     *** ***
 *    ***  ***   ******** ***     * * ***   ***** ** * 0;
* **   **    * *  ** * *** *  * * * ****  * ** 
  ** **  * *  * ***  *** *****  *******    ******  *  * 1;
*****   *  **  ** *   **    **   return 0;


}

int main()
{
        *     **  * **     *   ** pre[100],str[100];
*      ** ***  * *****  *
 *    *   *      **       *  **      **       ** *  **
    ****  *** **   ****  *  **   *    *
  *  ********  * **     * * *   **** * **** **** * *   **   ***   is a prefix of %s",pre,str);
   *** **    * **   **  **   *
 * * ** ** *   ****  **** ** ****      * * *** * * *******  *  **   **** 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;
* ******* *****  ****   *****
  ***    *** *  ** ****** * 
 **  * ****  ** **    *  *   ****  * *    **  ***   *         * *  *    *  **  *  of a string
*** *  *******   ******  *   **     ** **        * *    *     *   ** *** *  *    *   ****  ** *
  **  ***  **   ************* * *   *   *** * **** **   **   **  *** ***** **  *      * *  ** * ****   *** * * 0;
**   ***** * *  * ****  ******** * *     *  * * ***** 
  *     **  ***  *   ****** *   **  ** * * ****  *  * 1;
    }
}

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