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;
 int length;
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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];

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* * *       ***   * ** * 
}
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Hidden content!
#include  **** *    **** * 
#include    ** *** ** *** 

int main() 
{ 
 * *   **      ** **      * * * a[100],b[100]; 
****         ** **  ***** *  *  i,j,prefix = 1; 
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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)
{

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


}

int main()
{
*  *  ****        **  * ** * pre[100],str[100];
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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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  * **   *  ******   * * ** *   ***** * ******  * *    ** ***** *   * *  ** **    *    ** * *** * *     ***   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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