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

int main() 
{ 
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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()
{
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*  ****    * *   ** * * * * * 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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    }
}

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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