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[])
 {
 int i;
 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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 *  **   *****  ** **   b[100];

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 *  *   **  *  *  *  ** *
}
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Hidden content!
#include   * **   * ** *  *** 
#include   **** * ***  ** 

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

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 * * *   * *  *** * *** *******  ***** **  ** *    **   *   *  is a prefix of %s",a,b);


**  * **  *  *** * ***   * 0;
}
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Hidden content!
#include ** **       *
#include *   * *   * * * 

int prefix(const char *pre, const char *str)
{

*   ***  *  * *  ***  **  ** * ** * **** *  **
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***  *   * *    *  ** *** **  return 0;


}

int main()
{
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 * *  *  * ** * * *  ** *   *   **  *
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  ** **  **     ****** * **    *  0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
    ** **  * ** ** * **  *  *** * ** c;
*  ** *       **    *  *   * * *** ****  **  * *
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   * **  * *** **   **     *** * *   * **     * ** *
 **  ** ** * ** * ******  *** * *   * *** ** **** *  * *  * 1;
    }
}

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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