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() 
{ 
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}
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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)
{

 * **  * * * ** *  * ** * *  ***  *    **    * *  
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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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*  * ** *** *    **   *** **  *    * ** *
**** ***    *** ** **         *   **   ***   * ** ****   **   **   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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