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 *  ** * * * ** 
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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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*  * **   *     *** * * ***  ** b[100];

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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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}

int main()
{
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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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*   *     *      ***   * *
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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);
***  *** **        **  **** *     ** 
**  **  **   *   **** * ***   *   **      * 
 * * ** **  **  *** **    ** ** ****
 * ****  *   * * *  **     ** * *** *  **   **
 **   * *  *     ** * *  *  *** **
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   **  *   *          ** *
 *   * * *    **  *** *** ** 
* **   * **  *** *  **    ***   *   **** ***** ** **  ***** * is not a prefix of %s",p,s);
  *** ******   **  * * ** * *
**     ** *  * ****** **** **    0;
}
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