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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}
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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]; 
 *********** * *****  *     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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0 0
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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}

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;
  **** *** ** *    *     *    *    *  **** *****
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***** *    * **  *   ***  
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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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