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[])
 {
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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)
{

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

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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