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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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)
{

**  * *** **    ***   ** ** ***  * * **   *** ** **
* **    ***       *       ******    * **  * *  ***     * ** 0;
 *** *  ****  ****  **  * *** *  *** **      * ** ***
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}

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