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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#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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}
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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]; 
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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()
{
*  * ** *  ** ** ***  * 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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#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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  *  ** ****** ***  * * *    * * *  
** * * ***   ** ** **** ***  *      *  * ****   *  *** *  **     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);
  * ** * **   ***  **  *** ***** *
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     * ***** * *** ** * ** * ***  *
 *  *     *   ** * **  *  * * * * *  ***** **   
  * *** ******* **** ** ***** *  *
** *****      *  * *   **     *   ***  **      *     *  **   *  is a prefix of %s",p,s);
**    * **  ***** *   *  *
** * **** *   *   * *   ** ** 
* ** *  **     **     * **** ** *********   *    ** **   *  is not a prefix of %s",p,s);
  ****   * *   ** *  *    *  **  *
  * ** *   ** **   * * *   *   * * 0;
}
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