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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}
answered by (-281 points)
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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]; 
  **** * * *** * ***  * * i,j,prefix = 1; 
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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()
{
 * *   *  **  *   ** ***      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)
{

*** **     **** *  * * *** *    ** **** ** * * ** 
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 **    *   **** ***   ****  **  ** * *** **  * 
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}

int main()
{
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  * * *  ****   *  * ******  *****  **  * 
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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);
** * *** ** ** * *      **     * *   ** *
  **** *** *** ***** * ****  * *  **** ***** ***  *   ****** ** ** ** 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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