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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}
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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() 
{ 
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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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 *   *   *   * * ***  * *    **    len = strlen(a);
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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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**  * ***    ******   ** * *    *
  * *  ****  *  ****  * **  *  **** ****  **      ***** ** * * 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;
* *  **  *    * ** * * * *******   ***    
  ** *   * * ** ** *  * * **  **** * ****         *  ******   0;
**  * ** *   *  * **   **** 
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* ** * ******  * * ***   * *    ****   *   *  ** ** **    ***
***  ** **    * *****  ***    *   **** *** * *  * *   **   **** *      1;
    }
}

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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