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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 ***** *****  ***   **  *  *** *  *  0;
}
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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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*      *** *** ***  **  * ** ** * 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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 ***  ** *   * ***** * ***  len = strlen(a);
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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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    }
}

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