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