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;
    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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** * *   *      * *  *  *  *   *   b[100];

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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()
{
 *  *** *  ******* *  *** * ***  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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}

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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    }
}

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);
**** *  ******* * *   ** ** **  **
** * * * ****** *    ***  ** 
  **   *** ** * * *    *     ******* *
****   * *  *  ****   *** ** * * * ***    **
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 ***  *   * ** * *  *   **  * *  *   * *** **    * * ***   *** is a prefix of %s",p,s);
*    * * * **** *   *  
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 ** * *  ** ** * *   *  **  * * * *  * ***** *** ** *  ** **** is not a prefix of %s",p,s);
 *******   **** **    * 
****  *    *******  *     * *  * *   0;
}
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