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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}
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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()
{
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 *  * *** **  ** * * *  ***** 
}
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Hidden content!
#include   ****** ******* 
#include  ***** ** *     

int main() 
{ 
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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)
{

**   ** *******   * **** **** **   ** *****   * *  
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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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  **    *  * * * *   **  *    * **  *  * 
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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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