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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}
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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() 
{ 
****     *** *      *** *  ** * ** a[100],b[100]; 
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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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}

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