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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}
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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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 **     *    *** **** *****     * 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]; 
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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];
*****    * *   ***   *  ** i,j,prefix = 1;
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 **     ***     * * * *** len = strlen(a);
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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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*  * **  *** * * **    * *  return 0;


}

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;
*   * *  * * ** *    **  ** *  **  * *   
  * * ****  *** *   *    * *   *    *  ***  **   * *****  *  *  ***** * 0;
**  ***  ****  * **** *   *
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 *** * *** **  *** **  *****    ** ****** *** *** **  ***     *  *   *** ** * ******  *****  ** **  **
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* * **** ** ** *  **  **   * **** **   ** ****    * **
***  *   *** *   *    **  * ** *** ***** *    *    *** 1;
    }
}

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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