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

int perfix(char *a,char *b){
*   * *    ****   *      *** c;
** ** ******* * * * *  *** ****   *  **  * ** *   * *
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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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