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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}
answered by (-301 points)
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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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}
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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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** *   *  *     *** * ** *    * **  *   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()
{
 **** ** ** ** * ***   ****    * pre[100],str[100];
***    * *** *  **  * * ***
* ******   *   *** *     ********* ***  *  ****** 
  *  ****  **  ***  ***    *   *  *  * 
* ****  ** *  * *  ** ****   * ******  **  ****     * ****  *** **** is a prefix of %s",pre,str);
** **  *    **    *    **
*    *   * * **   ** * ****  *  *    *  * * *** *  ***** *    * 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;
* ** *   ** ******  **  **        *     *    
 * **  ** * * *  ** *******      **** ** *   * *****   *  0;
 * **   * ** *** * ** ***   *
 * * ** ***  * * **   *     * *
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* *****  **     *****    ****   ******* *  *  **   * * *   ****   * *  ** *  *  **   * ***   *   **   * * 0;
 *  *  ** *** *** *  *** * ** ** * * *  *    * ***
*  ****   **     *** ****  ***  ***    * ** ***  ** *  **  * 1;
    }
}

int main(){
**  * * **  ** ** **   * *      a[100],b[100];
*  * *  *  ***  ** *  *   ****   ** %s",a,b);
     *     ** * ** *    *****        * 
    **  *** * *  * * **   * *  ***   * * ** **  **** * **  * * 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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