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

int main() 
{ 
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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)
{

   *** *  ** ***** ** **** * ***  ** ** *    **
* * *  **** ***  ***  * *  * *** **    *  *    *** * * * ****  *  0;
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*  *  ** **   ****    ***   * return 0;


}

int main()
{
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** * ***  ** * *    ****
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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;
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*** *  * * * * * * *   * * ****    *   **  *  *****  * *  *
 *** **  *  * * ***  * ** * * ******* * * ***   *** *    **** 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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