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   **   ** * *** * 

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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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    }
}

int main(){
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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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