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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*** *  * * *  *****  **** * * *  b[100];

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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)
{

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

int main(){
 ** * * * *  *   ********     ** a[100],b[100];
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 **** *   *** *  *  ****** ** * **
 *  ****    **  * *  *   *   **   * *  * * **  *    *  ** ** * 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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