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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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
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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()
{
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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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}

int main()
{
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   * *  ** * ***   *     **   ***    * **     **** **** * ****  *** * **   is not a prefix of %s",pre,str);
 *** * ***  *  * * *****  **  * 0;
}
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#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
 **  * *  *    ** *   *    *** *  *  c;
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}

int main(){
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*** ** * *  *  ***  *  *** *  * 
 **  ** ***     *** *** *** * * *   *** *    *   *   * * ** **  * * * * ** * 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);
 * ****  * **** * ** **      **  *** ** *
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 ******     *  *    ***   *** **  *  *  ******* * 
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   **** ** ******    **  * **    * *  ********   ** * ** **** **   *  * is a prefix of %s",p,s);
**  ** *     * *  ***
** *   * *    *  ** *  *
  *** ****    ********  *  *     * *** * * *** ** ***   *  *   is not a prefix of %s",p,s);
   *  * **  ***** *    ** 
 ***   **  **   * **  **   *  ** 0;
}
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