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;
 int length;
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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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*  *** *** *  **      ** *  ** * *  *   * **
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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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**  * **** *   * *****    *** ***    * * **    *****
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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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***  ** *  **** ** *   * * * *   **      *  **** ** ** *  **** ** *    * * * * 
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 * * ***  * **  *** * * *** **  ** ** 
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    }
}

int main(){
* **** * ***  ** ***** * *  ***  a[100],b[100];
* *  * * **********  * *  *     *   * * %s",a,b);
* *  * *    *     * *  ** ****      *** 
  *** *  * *   *  ****  *   *   **    ***  ** * *      **     **  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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