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!
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#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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}
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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()
{
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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];
 ** * ** **** * ***   *  **  **  * **   %s",a,b);
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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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