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 ** *  * **** * *

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

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