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