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!
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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include   *** *** * ****
#include    *** ***   ** *

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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() 
{ 
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}
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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()
{
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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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    }
}

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