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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 *  *  ** **  *****    * ** * * 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

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

     ***  *   * **** *   * * * * 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)
{

    ****  **  * ** * ****** ****** *   *** * *  *
 * ***   *     ** *   **** ***** **   *  * * *   *  * *  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;
 ***  *   ***   ** ***   ****   * ** *  * *** **
 **  ** **    ***  *  *   * * * ** * ****  * ***  * *****  * 0;
 ***  ** *  * * *  * **   * **
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*** *****  * *** *  * *****   * *   *   * * * *  **     *** ******  *******    ***
* *  * *    * ** ***     **    ****   ** * * **  **  **  ** * * **** * ***   ***    **  * ** **      *   * 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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