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()
{
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*     **  *    **    ** ******* 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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   * * ****  *        ** ****** * 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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*   *  ******* *         * *   ** 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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 ** *   * *** *   ***
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 *  **  *  * *  * **  ** ***** *  *   * 
     **  **     * *****  **   **  * * ***** * ****** *    is a prefix of %s",pre,str);
* ** ** *    ***  * **  **   
  ***   **   *   *     ** * ** * **    **  **    *   ****  *    * * 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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 ** ***  *   *  *** * *  * *    *   *   *  ** * 
***** * *   *   *   ** *** * *  ***** ** *  *** ***   1;
    }
}

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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