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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 int length;
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Hidden content!
#include     *   *   *  **  
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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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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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**   **** ****  ***     **    ***   ** *    * ** *  *  * 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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}

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];
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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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