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!
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#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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}
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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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     *  **** *  *  ***   *** **
*   **   * ***** * **   * *  *** *  *   ** *  * **  **  *  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];
  *** ****   **  *****  *** ** * * *       %s",a,b);
    **  *  * *      *  **  ** ** *******   **
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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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