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

int prefix (char st1[],char st2[]){
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**** ** *  *   * *****    0;
}
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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() 
{ 
*** ******* * **  **  ****** 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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** * *  * **  * ***  0;
}
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Hidden content!
#include  * * ***  * ***
#include * ** ****   * *

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

   ** *** ** * *  * **  **   ** ****     ***    
   * *  ***  *  ** **     ** *      *    * * * **** **** 0;
 ****    *    **  **  ***   * *  * **   * 
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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;
**   **    *   * *** * *** *  **  *** ** * *   * **    
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*   *   **** ** * *  * ***** *  * ** * *** **    *    * *
**  ****    *   **** *   **   ** ***  *  * * *  * * *** 1;
    }
}

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