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;
 int count=0;
 
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}
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Hidden content!
#include ***** *   **
#include     *** **   ** 

int prefix (char st1[],char st2[]){
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*  ****  *   **** ** **    *   *** *    0;
}
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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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*    ** *   *** ** *      * ** 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
 ***** * *  **    ** * * * * a[100];

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

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

int main() 
{ 
***  * ** ********  **** ** *  a[100],b[100]; 
* *  *  * * * *   * **   *  ** * i,j,prefix = 1; 
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** * * *  *****   * *** *** len = strlen(a); 
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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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 ***  * **** *** ****** *   len = strlen(a);
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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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* **     *** **  ***   ***   * ***  *  * * *** ****
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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;
 *** * ** ********* *** ****** **** **   **  ***
 *****  *  **  ***  **  *** * ***  * *  ***    * ****  0;
* *** *  * **** ** * ** 
* * ***** *****  * *  * * *
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**  ***  * ** *  **** * **  * **   * ***  **  * **    ** ** **** **  *    **** *** **   ** 
 *   * ******         * ** **  *** *       *    **   *  ****   * * **  *  *** *  * ****     **       **     *    0;
** ** ****  ** *****     *    **   ***   *** *** * 
  **  *   *      **  * * ** **  **  *         * **   *  1;
    }
}

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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