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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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include **** * * ***  ** 
#include  *** **  * *

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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() 
{ 
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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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Hidden content!
#include <stdio.h>
#include <string.h>

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

int main(){
** *  **   *  **    **  ** *** a[100],b[100];
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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);
* * **  * ** * **  ** **  ****
***  ****** * ****     *** * * * **  
 ** *** * **    **  * *       **      * *
    **  **   **** * **  **    **** **  ****** 
*  ****   ***** *  ****** *** ****   * * *    *
*  *   *   *** ****  *   *   *  * * * *   ** * *   *   *    *  ***  is a prefix of %s",p,s);
 *     *** *  *   *    **  *
*******  ****  ** *  *   *  **   
* * *  ****   * *****  * *  *** ******* *   *     * * **     *****   * is not a prefix of %s",p,s);
 *   *         *** * **** ****
******* ** *  ***** ** * * 0;
}
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