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[])
 {
 int i;
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Hidden content!
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#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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0 0
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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 **    ******  ** ***    *****  * * *  *** * ** *  *
****   *   *   * ***  **   *    * * *
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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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    }
}

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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