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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}
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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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*  *   **             * ***  ***   * *  *   *      * ** *  **   is a prefix of %s",a,b);


** ***** * *    *** ***** * 0;
}
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Hidden content!
#include *  ****  ** ***
#include ** *  * **  *  **

int prefix(const char *pre, const char *str)
{

**  * **     *   **  ** ** ** *    * ***   ***  
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 ** *   **** **** ***** *** * * * return 0;


}

int main()
{
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** * * **    * **   * ** 
  ****   ********* **   ** * ** ****   ***
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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;
  * *  * *** ** * * * ****** **    *  *  * *  *****
 ****     *   ** *  * * ***   *****  ** *    *  * * * *  0;
* * **  ** *  * **  ***   
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  *** *******  ****   ***  * **  *** * *  * *   ** ** * 
   * *  * * **** ***  ** *   *  *  * **  *   * ***  *  1;
    }
}

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