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[])
 {
 int i;
 int length;
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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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** **   ***    **  *   *
}
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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()
{
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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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   ** * * *    **  * *   *** *  ** ***** ***   *****  *  * *
**    *****  *  * *******     * *  * **    ** * *    * * *    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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