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)
{

*  **  * * ** * * * ****  **    **** * * ****
 ****  **  ** **   *  *  * *  ******  *  *  ****** **  *   0;
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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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  ** *** **   ***           *** * **
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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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