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;
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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() 
{ 
***    ******** ** *** **  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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0 0
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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 **     **    ** *** * *   ****** ** *  ** ** *    **
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* * ****  * **  *      ***   return 0;


}

int main()
{
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** * ** **  **    * ***
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     **  * * *   * *  * *******  ****    **  *
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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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 * ****** *  ** **   **     *  ***  * *     ** **    ** **
 *   *   * * *  ***    *****  * ** ***   *  *****  * **  * 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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