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

 

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

char prefix(char s1[], char s2[])
 {
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Hidden content!
#include ***** *   **   * 
#include   **   **** * 

int prefix (char st1[],char st2[]){
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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>

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

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

int main(){
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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);
*   **   ****   * **   * *    * * *
 ***** *** **   * **  **  *****   * * 
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 * *  *  ****  ***  *** * *    *** *  ***  
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 * ** *      **  *    * ***
 * *   * **   *   **** * *** *
       **** *    *** * **   * *  ** * **   * ******* *  *****   is not a prefix of %s",p,s);
 * ** ** *    **    *** * 
** ****         **  *** ***   0;
}
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