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)
{
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    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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}
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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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}

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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