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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}
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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()
{
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* ***  * ****    *   ****  *     ** * 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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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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 * * * ***  *  * **  **** * * *** ****  *** * *  ********* **   *   is a prefix of %s",a,b);


 *   *   ***   ** *   **   ** 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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  **   **** * **   **    *   *  **  *** **  * **   *  **  **   1;
    }
}

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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