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 * *  **  * *  *  *
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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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}
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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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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)
{

 * * ****  **  *   * * * * * ** * *  **  ** 
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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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**  * * ** * ** ***    *   * **    ***    * * * ** ** ***     **
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    }
}

int main(){
*** ** ***       ** ***   a[100],b[100];
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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 a prefix of %s",p,s);
   ***  * **** ** *      *  *  **
  *******  ****  **   * **
****  * * * ** *  * * **  * ***    *  * * ***  * * * ** * * **  ** is not a prefix of %s",p,s);
* * ** *      ****   * * *** 
*   *  **  ****  ***   ** **     0;
}
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