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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}
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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]; 
*  ** *   * **   * *  * **  i,j,prefix = 1; 
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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)
{

 *  **** * **   ***  ** ***  ** ** ***     *  *  **  * *
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}

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