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  * **  ***  **   
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char prefix(char s1[], char s2[])
 {
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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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}
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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() 
{ 
* * *  * * ** * * ** * ** 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()
{
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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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 **  * * * **  * ** *   ** **    *    ***  * ****  **  **** * * *   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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    }
}

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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